Template:Toshinori Synopsis/Rise of Villains

Provisional Hero License Exam Arc
The Students train under the supervision of Shota, Ken, Nemuri, and Ectoplasm in Gym Gamma. The goal is to develop their Quirks and Ultimate Moves before the Provisional Hero License Exam. All Might appears at the entrance to the gym because he wants to help. Shota tells him he should focus on recovering but All Might replies that it is his job as a teacher to oversee the training of his students. When Katsuki defeated an Ectoplasm clone, Shota and All Might comment on Katsuki's prowess and that he will only keep growing stronger from here on out.

The other students of Class 1-A continue their training and thinking about their special moves while Izuku is still puzzled on what to do next. All Might approaches him and gives Izuku advice: he is still trying too hard to imitate him, which confuses Izuku. Before he can question further, All Might moves on to give advice to Eijiro. All Might is teaching Izuku to think independently. Shota wonders why his sudden interest in helping students, when he spots a book sticking out of his back pocket. It is titled "Even Dummies can be Teachers! Easy Education Theory". Shota is stunned.

Four days later at Gym Gamma in the midst of training, All Might shows up and Shota Aizawa tells him that Class 1-A are progressing nicely. However, the rock Katsuki used to test his AP Shot cracks and begins falling towards All Might. Katsuki and Shota warn All Might, but Izuku jumps out and destroys the falling wall with a single kick, showing his new fighting style, which he names "One For All: Full Cowl - Shoot Style". All Might smiles at Izuku in approval.

All Might comments that Izuku's new fighting style it's a big step in the right direction, and will help him in the Provisional Hero License Exam. Shota warns All Might to stay a safe distance away from the training session to avoid being injured. All Might apologizes to Katsuki, who storms off shortly after telling All Might to be more careful. The former Symbol of Peace is staggered about the fact that throughout his life, he has been protecting others. Now, All Might realizes that he needs others to protect him and is perturbed with the role change.

Several days later, while the students of U.A. participate in the Provisional Hero License Exam, All Might goes to Tartarus, a special prison for criminals for whom the death penalty is not enough. All Might is there to sits down to speak with All For One. All For One tries taunting him, asking where Gran Torino is and why he has come dressed in his hero costume. All Might ignores him, asking where Tomura is. All For One states he doesn't know and has allowed his successor to carry on his will.

All Might tries to ask how he is still alive. All For One doesn't answer and says its a pointless question. He begins taunting All Might by saying society is beginning to turn on heroes, while sensing growing insecurity in the world due to the new heroes leader, Endeavor. All Might stands up in anger, while someone on a radio com asks him to please back away. He states he will not die and will not allow Tomura to kill him. All Might leaves while All For One continues to taunt him.

After leaving, he is in a car speaking with Naomasa. He then receives a text from Izuku with a picture of his provisional license saying "Thanks to you, I was able to take another step forward!", which causes All Might to smile, though he does not reply to the text.

That same night, he gets word that Izuku and Katsuki are fighting. He goes to stop the fight, but instead he stands back out of sight allowing the two boys to fight it out while eavesdropping on their conversation. After Katsuki pins Izuku down, he walks up to them. He apologizes to Katsuki for not realizing that he has been blaming himself for All Might's condition. Katsuki asks why All Might chose Izuku as his successor. He states that despite being powerless, he was more of a hero than anybody else on the day of the sludge villain attack, and he judged it was his responsibility to help Izuku stand in the arena, instead of Katsuki who was already standing in it.

Katsuki yells that he's weak and because of it, All Might became like he is. All Might goes up to Katsuki stating it was not his fault and apologizes for not realizing his pain sooner. He hugs Katsuki but is pushed away. He then gives advice to Katsuki and Izuku stating to be a hero one needs to both want to rescue and win, and if either is lacking, they will lose their sense of justice. He tells them if they can recognize each other and raise each other up, both of them can be heroes who both win and rescue. All Might then proceeds to tell Katsuki everything about One For All and how he passed it to Izuku. After hearing it, Katsuki realizes how dangerous of a secret it is and promises to not tell anyone.

Back at Heights Alliance, Shota restrains the tandem and punishes them for breaking the rules. All Might tries to calm him down by telling him that the fight was brought about due to Katsuki feeling guilty about his retirement. Although he understands the reason, Shota still refuses to let Izuku and Katsuki's transgression of fighting go by and gives them house arrest as an appropriate punishment, as well as dorm cleaning duties while also demanding a written apology.

Shie Hassaikai Arc
Several days later, after Shota Aizawa spoke to Class 1-A about Hero Work-Studies, Izuku reaches out to Gran Torino for a Work-Study opportunity. Gran Torino has to refuse because he's busy working with the Police and recommends him All Might's former sidekick, Sir Nighteye.

Izuku goes to All Might in the staff room and asks him to introduce him to Sir Nighteye for a Hero Work-Study. All Might refuses to help Izuku, much to his surprise. All Might says that there are three reasons for his decision: first, he was against letting the first years conduct Hero Work-Studies so early; second, he wants Izuku to focus on strengthening his Shoot Style; and third, he and Nighteye broke off their partnership not in the best way several years ago. Izuku tells All Might that if he is under the guidance of Nighteye, it will serve as a strong point of comparison to him and he must become stronger than anyone else.

All Might does not dislike Izuku's determination but he still will not be getting an introduction, not from him, so he calls Izuku and Mirio to the nap room to talk about a few things. All Might tells Izuku that Mirio is serving a Hero Work-Studies under Nighteye and asks Mirio if Izuku is fit to work under Nighteye. Mirio replies that there is no problem and considers Deku fit. However, Mirio does not understand why it is not him who presents Izuku to Nighteye since they were friends and allies and Nighteye still has great respect for him. All Might replies that he does not feel comfortable meeting Nighteye because he became exactly what Nighteye warned him about.

All Might allows Izuku to carry out his Work Studies under the guidance of Sir Nighteye. However, Izuku's first day is full of bitter revelations. Izuku discovers the truth about One For All, that he was not the right candidate to inherit it and that Mirio was the true successor of All Might as a Symbol of Peace. This makes Deku start to doubt himself. Nor does it help him that also on his first day he couldn't help a little girl called Eri, daughter of Overhaul, leader of the Shie Hassaikai, a Yakuza organization that Sir Nighteye was investigating.

Unable to keep going like this, Izuku goes out in search of All Might to ask him questions, finds him outside of U.A., jogging. Izuku asks him why he didn't tell him anything about Sir Nigheye knew about One For All and that Mirio was supposed to be the true inheritor of the Quirk. All Might states that there was no need to tell him everything, to which Izuku yells that there was and demands to know the whole truth. All Might decides to tell Izuku the truth but he mustn't regret it, to which Izuku replies that he won't.

All Might starts telling him that Sir Nighteye was his sidekick for years and that they formed a great team. But six years ago, after his fight against All For One they dissolved their partnership due to his injuries and because of the differences in their values. Nighteye warning him back then to stop continuing his hero duties due to his grievous injuries and look for a successor. He refused because that would generate a period of fear and chaos. Sir Nighteye revealed to him that the real reason he wanted Toshinori to stop is because he predicted his gruesome death at the hands of a villain in six to seven years.

After their argument, they went their separate ways. Nezu recommended Mirio Togata, but he ended up meeting Izuku before he met Mirio. All Might did not want to tell Izuku all of this since he was his fan and apologizes. Izuku is shocked and distraught with the truth All Might told him; not only he was never meant to be All Might's successor, but also that All Might has roughly a year to live.

All Might continues and tells him that when he met him, he considered him the perfect candidate to inherit One For All. Toshinori told Nighteye about this, but Nighteye was vehemently against All Might's idea. Their heated debate further drove them apart, and Nighteye took it upon himself to cultivate Mirio, whom he believed to be the truly appropriate successor.

Izuku asks Toshinori if Nighteye's Foresight can be changed. However, Toshinori's answer crushes Izuku's hopes; there is a margin of error of his estimation, but nothing can change the future he sees in his Foresight. Toshinori tells Izuku that after he had accepted his inevitable death with ease and because the goal was in sight, he ran full speed towards it. Toshinori reveals that the goal was his final confrontation with All For One at Kamino and that he planned on dying there.

However, Izuku was there, a timid Quirkless boy who day after day rose to meet his expectations. Izuku's determination and his mother's encouragement gave him the will to twist Nighteye's prediction and try to stay alive to see the boy grow into a hero worthy of being the Symbol of Peace. Izuku promises All Might that they will defy fate together.

During the Shie Hassaikai Raid, Sir Nighteye is fatally wounded by Overhaul. Sir Nighteye's wounds are too serious and the doctors tell that he won't last. Bubble Girl, one of Sir Nighteye's sidekicks, calls All Might to see him at his last moments. Izuku and Mirio are also there. Nighteye remarks on how it fitting it is for his mentor to visit him one last time on his deathbed. All Might laments on not visiting him before and begs his old friend to pull through so he could make amends.

Izuku begs Sir Nighteye to live as Sir Nighteye claims that he does not blame All Might and only wanted him to be happy and is fine with All Might fighting against fate. Sir Nighteye has wanted to change All Might's future where he is murdered but could not find any answers. However, Izuku showed him a way. Sir Nighteye hypothesizes that everyone's wishes for a better future changed the outcome. All Might and Izuku grieve as Sir Nighteye is satisfied with his changed views of the future never being certain.

In his last moments, Sir Nighteye says goodbye to everyone, tells All Might and Deku that he is thankful for having met them, and uses Foresight one last time to look into Mirio's future, assuring him that he will become an outstanding hero. Sir Nighteye passes away peacefully after telling everyone to keep smiling, as society needs smiles and laughs to bring about a brighter future.

With the last words spoken, Izuku, Mirio, and All Might are left crying at the loss of their beloved Sir Nighteye.

Remedial Course Arc
Because Shota must take care of Eri, Toshinoi becomes the substitute for Eraser Head for Katsuki and Shoto's Provisional Hero License Course, with Present Mic as his bodyguard. Before the exam starts Endeavor enters thanking All Might for looking after his son Shoto, he then demands to have a proper chat with All Might.

All Might alongside Endeavor and Present Mic enter the room where the training was being held, and Endeavor shouts Shoto's name to encourage him and gains the attention of everyone there. Everyone in the room were merely curious as to why he was there, but they grew ecstatic upon noticing All Might with him.

While the students have the trial to take care of a group of unruly children from Masegaki, the former and the new number 1 heroes have a conversation. Endeavor asks the former Number One Hero what the Symbol Of Peace is, telling him about how he became the Number Two Hero at the young age of 20 but immediately knew he would never beat All Might, which is why he entrusted everything with Shoto.

In response, All Might states that he always believed that the country needed a symbol to be their beacon of light, and in doing so he ignored the people around him, such as his former sidekick. All Might tells Endeavor that he knows his struggle of filling in his spot as the Number One Hero and tells him he does not need to follow in his footsteps to become the same symbol but find his own way of doing things instead.

Both heroes witness the success that the students have had with children, All Might tells Endeavor that the reason to be strong is very simple, and believes Endeavor knows the answer to that simple question. After the trial ends, he talks with the Shiketsu High School teacher about U.A. High School and Shiketsu starting to work together in order to stop the League of Villains.

At the beginning of October, All Might accompanies the Work studies group to attend the funeral of Mirai Sakaki. Toshinori pays his respects to his former sidekick and friend, saying goodbye definitively to him, before returning with his obligations.

U.A. School Festival Arc
Per Izuku's request, Toshinori meets with him at the school's break room. After discussing the preparations for the U.A. School Festival, Toshinori asks Izuku why he wanted to meet at such a busy time to which the latter expresses his desire to learn long-range attacks. Izuku frustratingly tells Toshinori that even with his power at 20% he could not hold his own against Overhaul, and had it not been for Eri he would not have been able to win.

Understanding his problem, Toshinori tells Izuku that he should use ranged combat as well, and both go to U.A.'s school grounds forest sector, Toshinori asks Izuku to use One For All 20%. Izuku activates One For All 20% and even though it starts hurting him, Toshinori tells Izuku to remain in position and unleash his attack. Izuku jumps up and kicks, which releases a monstrous burst of wind. Toshinori congratulates him and was going to teach Izuku to properly unleash wind pressure after his overall power limit passed 15%.

Toshinori affirms that Izuku can unleash wind pressure without his body breaking, and tells him that he must take a moment to rethink through his journey. Izuku does so. All Might states that, once Izuku's maximum limit had passed 15%, he had wanted to tell him that he was not always bringing out 100%. Izuku is struck with realization, that if All Might had continuously moved at 100%, he would have caused a devastating windstorm in the surrounding area. Izuku realizes that he cannot move long at 20%, and surmises that he must use One For All 20% in one area, which not only releases a decent amount of power but prevents his body from becoming completely immobilized. Toshinori advises that Izuku needs much subtler control than he has exercised now. An encouraged Izuku sees that he needs to refine his body parts that require the most motion.

The days of the week go by, and while Deku practices with his classmates for the School Festival dance show, he also trains to be able to perform long-range attacks with Toshinori Yagi. As Toshinori advises Izuku to avoid internal bleeding, Izuku has trouble keeping control of the wind pressure at critical moments and asks Toshinori for his advice, but he does not have any helpful suggestions since he was able to use One For All freely from the very beginning.

Then, Toshinori hears a noise behind him and catch a flying ball that was flying at him and Deku from behind without turning around. Mei Hatsume appears and reveals that she is there testing her inventions. Mei notices and informs Izuku that he will soon have the support item he has requested. As Mei leaves, Izuku tells Toshinori that the item he requested has to do with a new technique he has developed. Toshinori shocks Izuku with the revelation that he once used support items as well, but the equipment was too bulky for him and was not effective in close range combat. While he finds reinforcing oneself with items to be a good strategy, Toshinori reminds Izuku not to rely solely on support items too much.

The day of the festival has arrived. At 6:30 p.m., Izuku is training with Toshinori when a Mei shows up and gives him the support equipment he requested: a pair of gloves. Toshinori notes that back in his day his support equipment was quite bulky and is surprised that support equipment nowadays are quite compact. Mei gives Izuku the manual for the gloves and runs off; Toshinori decides that Izuku should try out the gloves, with which Izuku agrees.

A few hours before the school festival begins, Izuku has to go out running errands, meeting Gentle Criminal and La Brava on the way, two minor villains who wanted to infiltrate the campus. Izuku manages to stop them but the combat delays his lap a lot, but fortunately, he arrives in time to participate in the performance of Class 1-A, which is a success.

After finishing the show, Toshinori scolds Izuku for worrying everyone with his delay, for which Izuku apologizes as well as for the scuffle between him and Gentle Criminal. Toshinori is well aware of the situation from Ryo Inui and Ectoplasm. Although Ryo praises Izuku for not getting injured and for preventing the festival from being canceled, he scolds Izuku for not contacting the heroes to take charge of the situation.

Izuku acknowledges his fault which satisfies Ryo who sends Izuku flying towards the festival, telling him to have fun. Toshinori thanks Ryo who gets over-excited and starts playfully attacking Toshinori.

Pro Hero Arc
At U.A., All Might watches a report of a Nomu attack in the Teachers Lounge along other members of the U.A. Staff. He is horrified as it showed Endeavor being injured and overwhelmed by Hood's attack. All Might grabs his chest as he watches this scene, worried for his colleague.

Toshinori then watches as Endeavor regains his strength and defeats the Nomu by incinerating it with Prominence Burn. He then witnesses Endeavor using a pose similar to the one he made to symbolize his victory against All For One, and is shocked by this feat.

Joint Training Arc
One night, Izuku experiences a dream where the First User interacts with him and shared his memories. This dream ends when One For All managed to activate on its own, causing a great mess in Izuku's room and shattering his window.

The next morning, Izuku tells All Might everything that happened about his dream, which leaves him surprised. All Might tells Izuku that he also experienced similar visions. His master told him that they are vestigial remnants of the prior generations of One For All rather than simple dreams. However, he tells Izuku that he is the first user of One For All being able to interact with the vestiges. All Might tells Izuku that he truly does not understand what happened that well and they should search for answers together.

Izuku goes to the industrial training area, where Classes 1-A and 1-B are about to compete against each other in a Joint Training Battle. Joining them is Hitoshi, who is eager to enter the Hero Course. The teams and the order of participation are organized by lots. All Might and Midnight come to spectate the battles.

After round one, in which Hitoshi participates, Shota asks All Might what he thinks about Hitoshi since this exercise is his test to get into the hero course. All Might claims that Hitoshi showed great potential and expects the next set to be even more passionate.

After round two, All Might asks Izuku if he has felt anything weird since his dream about the previous users of One For All. Izuku replies that he hasn't, and All Might tells him that he will ask Gran Torino if Nana ever mentioned anything to him about similar visions. All Might tells Izuku to be careful in his match against Hitoshi, as Hitoshi seems to be a piece of the puzzle, as far as the visions are concerned.

Suddenly, Katsuki appears and asks them what they were just talking about, reminding the two that he is also in on their secret. They tell Katsuki that One For All managed to activate on its own when Izuku had his dream, which surprises him. Katsuki proceeds to berate Izuku, asking him when he will make One For All his own. All Might wonders if this is Katsuki simply showing his own type of regard for Izuku.

When Class 1-A, under Katsuki's command, achieves victory in round four, All Might confronts Katsuki and commends him on a great job well done. Katsuki brushes him off and Izuku congratulates him next. Katsuki yells at him out of reflex and then reminds Izuku that he's getting stronger. Izuku claims he'll still surpass Katsuki, annoying him. All Might claims Izuku has a good friend in Katsuki outside of his vulgar language.

The fifth and final match starts, where Izuku along with Ochaco, Mina and Mineta, faces the Class 1-B team, in which Hitoshi is one of the teammates. All Might receives a call and walks over to a private area to speak to Gran Torino. Gran Torino tells him about Nana's dream about One For All, the old hero mentions that around the time when Nana inherited One For All, she had a dream about a strange figure shrouded in dark fog telling her "It's not time yet…".

While the conservation goes on, something goes off with Izuku's Quirk, as dark energy begins to emanate from his body in strength, destroying his equipment in the process, and goes on a rampage. A horrified All Might tells Shota and Vlad King to cancel the match before anyone becomes gravely injured in the process. However, before they could intervene, thanks to the intervention of Ochaco and the power of Hitoshi, they managed to get Deku to regain control.

The fifth round continues under the watch of Eraser Head, Vlad King, and All Might. Vlad expresses shock as Shota decides to let the match go on, despite both teachers witnessing Izuku's Quirk going berserk, but Shota explains that he'll keep a close eye on Izuku just in case if he loses control of his power once again. He also notes that Hitoshi's brainwashing ability has managed to prevent it from injuring the participants. All Might questions Shota's decision, only for the latter to respond that he believes that all combatants still feel determined to fight out till their very last breath.

The fifth round ends with victory for Deku's team, and having obtained more victories than Class 1-B, Class 1-A is declared the winner of the Joint Training Battle.

After the Joint Exercise, Izuku, All Might, and Katsuki have a conversation about the latest events and revelations related to the All For One. It turns out that the black tendrils that Deku manifested are actually the Quirk of one of the predecessors, known as Blackwhip, and that Deku will manifest the Quirks of the previous One For All users. When Katsuki asks All Might about what he knows about the interactions of the predecessors and Deku having a new Quirk, he admits that everything is new to him and that he has no idea about the whole thing.

The conversation ends, when Katsuki asks if this turn of events has anything to do with All For One, explaining that it would make sense as he was the person who created One For All in the first place and he can also possess multiple Quirks. While All Might does not disregard that theory, he also states that it was the last thing he wanted to think of.

Around 7:00 PM in the evening, Izuku and Katsuki engage in a sparring match at Gym Gamma. Katsuki tries to activate the Blackwhip by putting Izuku in a dangerous situation, believing that it would activate it, but Deku reveals that it apparently can't be unlocked as of now. All Might immediately tells the two to halt the match, seeing that it does not work. Without knowing what to do, they decide to return to their rooms.

Meta Liberation Army Arc
In early December, All Might accompanies Shoto and Katsuki for the final test to obtain their Provisional Hero License. They eventually succeeded, and on their return to U.A. they witness a villain attack. All Might chases after Shoto and Katsuki as they confront a group of villains going on a theft spree.

While Shoto and Katsuki battle the villains, All Might assists in evacuating the bystanders. One of the bystanders stops to film the fight, while unaware that a light post is about to fall on her. All Might notices and is able to push her out of the way at the last moment thanks to one of Katsuki's explosions. He then gets berated by Katsuki for being careless.

After the villains are defeated, All Might is accompanied by the Pro Hero, Slidin' Go, who praises the duo for a job well done. All Might also congratulates the duo for doing a great job.

My Hero Academia: Heroes: Rising
During fall, Toshinori and Principal Nezu met with Yokumiru Mera at U.A. High School, who explained to them about the Hero Public Safety Commission's new program, the Hero Work Recommendation Project, to help to train the new generation of Heroes due All Might retirement.

Weeks go by, and shortly after winter begins, Class 1-A is sent to Nabu Island, a remote place in southern Japan. As the Class 1-A members are helping around the island, at U.A. High School All Might worries about whether they will be okay. Shota assures Toshinori that he should not be concerned, as Nabu Island is a quiet place where there have been no incidents involving villains in the past thirty years, and the students should be relatively safe from any significant threats.

Unfortunately, the island is attacked by the villain Nine and his gang, although the students managed to defeat them and send a S.O.S. Shortly after Class 1-A emerged victorious over the threat, a field force of professional heroes and the military arrived on Nabu Island. Toshinori helps the wounded Izuku and Katsuki, who had barely managed to defeat Nine. A barely conscious Izuku tearfully apologizes to Toshinori for giving One For All to Katsuki because he had no other choice if he wanted to protect the people on the island before losing consciousness.

Toshinori forgives Izuku, but is left surprised when he sees One For All still retained inside of Izuku. At first, he theorized that Katsuki must've lost consciousness before the transfer could be completed, but then theorized that One For All must've kept itself inside of Izuku for his willingness to risk himself to protect the innocent even if it means losing One For All. Tearfully, Toshinori thanks the previous users of One For All and his master, Nana Shimura.

After helping with the repairs, the Hero Public Safety Commission suspends the Hero Work Recommendation Project, so everyone returns to U.A.

Endeavor Agency Arc
At the end of December, Toshinori appears more skeletal than usual because he hasn't slept in a few days, collecting all the information he could find about the previous One For All inheritors and their Quirks to help Izuku. Nezu visits him to inform him that the next round of work studies will begin soon.

A few days later, Nezu talks to All Might and detective Naomasa through a video call. They talk about the fact that since all the students moved into Heights Alliance four months ago, they have been being watched to discover the League's spy, but in all that time no one has shown signs of being the spy, so it seems that the traitor is not one of them. All Might tells Nezu that all students of the Hero course are true heroes and none of them is the traitor, to which Nezu replies he knows that. Then, Nezu asks All Might if he will return to U.A. that day. All Might tells him that it is unlikely since he is very busy unless something happens to Izuku. Nezu reassures him by telling him that he apparently has forgotten that it is Christmas.

Subsequently, Izuku and Katsuki talk with Toshinori that they have accepted a proposal from Shoto to do their Hero Work-Studies with Endeavor. Toshinori thinks it's an excellent idea. When Izuku asks him about his training with One For All, he replies that there should be no problems because as long he has mastered the image of "locking" and "unlocking", All Might he doesn't expect that he will experience more outbursts. As for Katsuki, All Might tells him that it will benefit him to work with Endeavor since both are very similar.

My Hero Academia: World Heroes' Mission
While Toshinori continued to teach at U.A., a major city suffers from a terrifying terrorist act committed by Flect Turn, the leader of the cult known as Humarise, who detonated a Trigger Bomb in a large city, causing a large number of victims. As a result of this, the World Heroes Association requested his assistance to help them lead the heroes worldwide in defeating the terrorist organization.

All Might and the WHA Director organize a worldwide operation with heroes from all over the world to attack the 25 headquarters that Humarise has in different countries. Since the nature of the entire operation is strictly off-books clandestine, they must refrain from asking for help from local law enforcement.

Once the operation begins, the heroes around the globe successfully raid the Humarise branches in each of the countries, but they fail to locate the Trigger Bombs or apprehend the leader. All Might theorizes that Humarise has another base of operations that they missed, tellings his suspicions to the WHA Director, who orders the heroes deployed to the branches to be on standby.

Some time later, while he continues to help by advising them to coordinate the operation, the World Heroes Association receives an emergency call from Otheon task force, informing them of a shocking event: Izuku Midoriya has been accused of a mass murder of twelve people by the Otheon government, placing him on the most wanted list. Toshinori is totally appalled of the accusations against his pupil and successor, being unable to believe them, and distraught at being unable to do anything about it.

A few days later, the operation is compromised when Flect Turn hacked into every communications network and broadcast to the world that they have planted Trigger Bombs in the major cities of the twenty-five countries and they will detonate them in two hours. One of the WHA workers wonders if this might be a trap, and Toshinori replies that even if it is, they still have to do something about it, as Humarise's ultimatum results in widespread panic and hysteria throughout the countries. The WHA greenlights the heroes being deployed to each sector and fights in defense to quell the chaos and locate the Trigger Bombs.

When there's only less than 30 minutes left before the detonations, the WHA receives a message from Shoto Todoroki, who tells them that he, Izuku, and Katsuki had obtained a disarming key for the Trigger Bombs, and that they are now heading to Humarise's secret base, where the main system of the deadly weapons is. Since at that moment all the heroes are busy facing Humarise's soldiers, none can be sent to support them, so the only thing Toshinori can do is wish the three students luck in their mission.

For several intense minutes, all he can do is watch the heroes fighting relentlessly to remove the Trigger Bombs, while the countdown continues. Fortunately, when the count reaches the deadline, none of the Trigger Bombs blow up, indicating that Izuku's group succeeded in disarming the bombs worldwide. The workers in the WHA control room celebrate that the tragedy has been averted, and Toshinori congratulates everyone for it. With the crisis over, Toshinori returns to U.A. High School, congratulating Izuku for his valiant job to accomplish the mission.

Paranormal Liberation War Arc
Winter break ends and students return to U.A. High School. Class 1-A head to Ground Alpha to show how much they have improved with their skills and Quirks during the Hero Work-Studies. Because Shota Aizawa has to attend an emergency, Toshinori replaces him. He welcomes Class 1-A students at Ground Alpha, making cotton candy to make a joke on his catchphrase, which doesn't win over the students.

Class 1-A begins the training, battling Villain bots to showcasing their newfound abilities. Finally, it's Katsuki and Izuku's turn to show off what they learned working for Endeavor at his agency. Toshinori is especially glad about Izuku showing his improved control over Blackwhip. All Might recalls some of his interactions with him, holding back tears, but proudly looking on as he realizes that Izuku no longer needs his approval, as he's outgrown the need for it. All Might concludes the class, revealing that everything was recorded for Shota Aizawa to watch later, and encourages the students to keep working hard at their work studies.

Later, in the Teachers Lounge, All Might meets with Izuku and Katsuki, congratulating the two on their improvements, much to Izuku's delight and Katsuki's annoyance. All Might then places a notebook on the table that contains his research into the Quirks of the past successors of One For All. He reveals he couldn't find anything on the 2nd and 3rd users due to the era they existed in and the multifaceted nature of the Quirk. All Might asks Izuku if he made contact with the other users, to which he says no.

During the conversation about the previous heirs, Toshinori reveals that they were heroes who did not have particularly powerful Quirks, as All For One hunted down the strongest. Also, the concept of a "One for All successor" was not implemented until Nana Shimura chose him. Until then, the heirs fought All For One and got themselves killed for it at relatively young ages, and they simply entrusted One for All to their closest ally to keep fighting, until one day the Quirk grew powerful enough to defeat All for One. Katsuki then asks what the next Quirk Izuku will get, to which Toshinori says it'll be Nana's Quirk, which is called Float.

At night, he is sitting outside Heights Alliance, when Shota approaches him and asking him what he's doing, to which All Might says he isn't doing much. He asks about Eri to which Shota tells him she's asleep and he'll start training her this week. All Might offers his help, to which Shota appreciates. He then asks what's bothering All Might, to which he says that while he has decided to live, he can't help but feel powerless when he sees how much they've developed.

Shota tells him that because he bore the title of Symbol of Peace for so long, it's hard for him to accept that there are so many other things he can do for the students, such as being there for them, and to keep being the person he knows he is. All Might accepts the advice while asking what Shota wanted, to which he tells him that Naomasa sent a message to him asking for him to delay his meeting with Stain.

During the next two months, All Might continued to help train Izuku to be more proficient in Blackwhip, as well as prepare himself to handle Float, inviting Ochaco, Tsuyu, and Hanta to a training session. As the four got to work, All Might had a conversation with Katsuki who talked about how with all the Quirks starting to emerge, it will be harder to keep One For All a secret, which is what All Might has been preparing when the time is right.

Katsuki proceeds to talk to All Might about how Izuku tends to act by putting himself before others and how he's been unable to understand that. He also asks All Might how even though he added the age and cause of death for all the One For All users, he scribbled out one of them, starting to question if that means anything, but All Might quickly denies it, since he's unsure of what it means. He continues to tell Katsuki that he knows that him helping Izuku with his training is his way of trying to make up after everything he had done to Izuku, even though Izuku himself doesn't see it like that, and that one day the two will be able to talk things over.

By late March, the Paranormal Liberation War occurs, as the full might of the Heroes raid the bases of the Paranormal Liberation Front, with the intention of taking down the villains for good. As the events are going down, All Might is watching over Eri at U.A., observing the destruction of Jaku City on the news. After the War has concluded, All Might goes to Central Hospital, where he is seen holding the hand of an unconscious Izuku, who has remained in a coma for two days due to the extent of his injuries.

It turns out that during this time, Izuku is having a conversation with the vestiges of One For All, which All Might is able to sense through his ghostly vestige within the Quirk. The vestiges reveal that they've discovered that One For All eats away a user's lifespan if they already possess a Quirk, which is how the fourth user, Hikage Shinomori, died after holding the Quirk for 18 years, at the age of 40 (this being the information All Might scribbled out in the notebook).

They further reveal the reason All Might was able to wield the Quirk for 40 years is because he was Quirkless, shaping One For All into his own being, which is also why he is represented in the vestige world as a ghostly spirit. This ghostly spirit also contains all the information the real All Might knows, which is how the users were able to determine this truth about One For All through his research. It is because of how powerful the Quirk has become, and the decline in Quirkless people in the world, that they believe Izuku will be the last user of One For All.

After this conversation, Nana confronts Izuku about being able to kill Tomura, due to how dangerous he is and can be if left alive. Even though Izuku agrees there be no other way to deal with it, he declares that One For All is a power that is meant to save and not kill, and that All Might's actions taught him that, so he wants to try. The words bring tears to All Might's vestige and Nana, as the users accept Izuku's resolve.

As the real All Might senses the conversation, Hawks and Best Jeanist arrive and ask to speak to him. Hawks explains that they want to know what the connection is between Izuku and All For One because the media heard that the villain was after something known as One For All and Endeavor informed them that during the war, Tomura Shigaraki was targeting Izuku, and with the current crisis, they need to know the truth. Recognizing that there is no point in continuing to hide the secret of One For All, All Might takes them somewhere to tell them everything.

Days later, Izuku regains consciousness and is visited by his mother. A medic informs them that since Izuku's body has largely been able to adapt to his Quirk, his injuries weren't that serious. Despite that, he warns that his limbs may still be immobilized, so he advises him to be careful.

After the doctor leaves, Inko demands an explanation and Toshinori and Izuku decide to tell her the whole truth about One For All. This leaves Inko dumbfounded, wondering what will become of his son knowing that the villains will go after him. Toshinori tells her that they are making arrangements to protect him at U.A. but Izuku announces he won't be returning, since he does not want to put the people he cares in danger. He hugs his mother and tries to reassure her as Inko breaks down in tears, promising to return home to her.

Barely able to contain her tears, Toshinori remembers when he bowed to her at their home and declares that he knows he can't stop Izuku from going, so he offers to join him. He contacts Best Jeanist informing him of this turn of events, who accepts it, saying that he may be the only one who can determine Tomura's location after thinking of using him as the focal point of their efforts, so they will follow in his wake while maintaining a safe distance.

By the start of what would be Izuku's second year in April, he leaves U.A. High, with All Might accompanying him, after secretly leaving behind letters to Class 1-A explaining everything about One For All and his connection to the villains. The plan is for Endeavor, Hawks, and Best Jeanist to use Izuku as bait to lure out the League of Villains and determine Tomura's location, while they follow suit maintaining a safe distance.

This plan leads them to face a multitude of villains in order to find any clue about All For One and Tomura. To help his protégé and prevent further arm damage when fighting, All Might ordered a new support item for Izuku, called the Mid-Gauntlets, from America before the borders closed.