U.S.J. Arc

The Unforeseen Simulation Joint Arc is the fourth story arc in Boku no Hero Academia and the fourth story arc in the Yuuei Beginnings Saga.

After seeing how the well the students did in the Battle Trial, they now take a trip to the Unforeseen Simulation Joint Facility to train their rescue skills. However, villains unexpectedly show up and now the students must battle and survive their first real life fight against actual villains.

Electing a Class President
With the news that All Might has entered Yuuei's faculty, the press has been trying to get a scoop on All Might by going to Yuuei and asking students and teachers regarding information on All Might but their attempts fail due to the infamous "Yuuei Barrier" (a high tech security gate) keeping them out. In Class 1-A, Shouta Aizawa announces that their class needs to pick a Class President. After making a vote, Izuku Midoriya is elected as the Class President and Momo Yaoyorozu becomes the Vice President.

At lunch in the mess hall, Izuku, Ochako and Tenya sit together and have lunch. Izuku is unsure about being Class President but Tenya asserts Izuku that he will be all right. After Ochako notes Tenya's formal attitude, Tenya goes on to explain his history; that he comes from the prestigious Iida Family, a family that has been in Heroics for generations. Tenya goes on to say that he aspires to be like his big brother, Turbo Hero Ingenium, who is a famous Hero in his family. Suddenly, Yuuei's siren goes off, indicating that someone that infiltrated Yuuei. The students in the lunch hall evacuate in a messy fashion.

Tenya Iida: President of Class 1-A
However, Tenya sees that the mass media is outside and realizes that the siren wasn't indicating an intrusion. Tenya asks Ochako to make him float and jumps into the air. While in the air, Tenya boosts himself onto the emergency exit board. Tenya yells out to the evacuating students to calm down and says that it is just the press, causing the students to stop their panicking and thus stopping the chaotic evacuation.

Back in Class 1-A, Izuku makes an announcement; that he is resigning as Class President and declares Tenya to be his successor, saying that Tenya is the right choice after seeing his actions in the lunch hall. Thus, Tenya IIda officially becomes the Class President of 1-A.

Meanwhile, the Yuuei faculty see that most of the Yuuei Barrier has been disintegrated, indicating that someone did indeed infiltrate Yuuei. They wonder if an ordinary reporter could have infiltrated the academy. However, Mr Principal declines that possibility, saying that an element of evil instigated the infiltration and he wonders if the infiltration was intended to be a declaration of war.

Trial of Rescue: Class 1-A's Excursion to the USJ
It is Wednesday. At 7:55 in the morning, the Pro Heroes Kamui Wood and Mount Girl are fighting a villain called Vihara Headgear who has taken an innocent family hostage. The battle does not fare well for Kamui Wood and Mount Girl as Vihara proves to be quite strong. All of a sudden, All Might rushes through and uses Missouri Smash against Vihara, defeating him in an instant and saving the family in the process. Kamui Wood and Mount Girl thank All Might for his assistance. All Might then quickly leaves as he has to go to Yuuei.

It is 12:50 in the afternoon and in Class 1-A, Shouta Aizawa announces that their lesson in Foundational Skill of Heroics will be the Trial of Rescue. Class 1-A go on a bus to their destination. Class 1-A arrive at the Unforeseen Simulation Joint, a practical training area that is designed to simulate any kind of accident or disaster. One of the teachers for the lesson, Space Hero Thirteen (a Pro Hero who helps out with disaster relief) gives a speech to Class 1-A, telling them that their lesson will be about wielding their Quirks for the sake of human life.

An Unexpected Visit: The League of Villains Attacks
After the speech is finished, Shouta sees a black portal opening up and dozens of villains come through it. Shouta orders his students to huddle together and commands Thirteen to protect the students. Shouta gears up for battle. One of the villains says that All Might was supposed to be here according to the curriculum they procured yesterday, which causes Shouta to realize that they were the ones who infiltrated Yuuei. Another villain is shown to be disappointed that All Might isn't here and wonders if All Might will show up if they kill the children.

Shouta takes charge and orders Thirteen to evacuate Class 1-A and try calling Yuuei. Shouta goes to fight the villains and defeats many of them quite easily due to his specialty in one-on-group battles.

Meanwhile, Thirteen and Class 1-A attempt to evacuate, but the villain called Kurogiri stops them, telling the students and Thirteen that they are the Villain Alliance and that their goal is to kill All Might. Katsuki and Eijirou attack Kurogiri but fail to do any damage. Kurogiri uses his Quirk to teleport most of the Class 1-A students to different areas of the USJ.

Izuku is teleported to the Flood Zone area of the USJ where one of the villains immediately try to devour him. However, Tsuyu attacks the villain and uses her tongue to grab Izuku and throw him onto a ship. She also throws Minoru onto the ship as well and then climbs onto the ship herself. After thanking Tsuyu for saving him, Izuku wonders why the villains want to kill All Might. Seeing as how thinking will not help, Izuku declares to Tsuyu and Minoru that their only choice now is to fight and win, much to Minoru's shock.

Class 1-A vs The League of Villains
At Yuuei in the nurse's office, All Might tries to contact Thirteen and Shouta but is unable to. All Might decides to go to the USJ in a few minutes. However, Mr Principal arrives and tells All Might to relax. Mr Principal starts to talk about educational theories with All Might noting that he hasn't changed one bit.

Meanwhile, at the USJ, Thirteen notes that they cannot make contact to the outside world at all. Thirteen orders the Class President Tenya to dash to Yuuei to tell the teachers there what is transpiring and get them to come and help. Tenya is skeptical, thinking that running back to Yuuei while leaving behind his classmates would be cowardly and disgraceful. After some encouragement from his classmates and Thirteen telling him to use his Quirk to save others, Tenya decides to dash back to Yuuei. Kurogiri overhears their plans and goes to stop Tenya, but Thirteen stands in Kurogiri's way. Kurogiri and Thirteen prepare to battle each other.At the Flood Zone in the USJ, a shocked Minoru criticizes Izuku's plan to fight and win, but Izuku ignores him and begins strategizing. Izuku concludes that the Villain Alliance don't have information on their Quirks and while the Villain Alliance beats them in experience and numbers, they have the element of surprise on their side. Tsuyu and Minoru reveal the powers of their Quirks and Izuku uses this knowledge to plan a strategy. After one of the villain's strike the ship, the ship begins breaking apart. Izuku jumps off the ship and puts his strategy to work, using Delaware Smash on the surface of the water, causing the water to spread out. Tsuyu then grabs Izuku with her tongue and Minoru throws his sticky substance into the spread out water. The spread out water converges in the center along with Minoru's sticky substance (with the villains being pulled in), causing all the villains in the water to be stuck together by Minoru's Quirk. With the villains stuck together, unable to do anything and thus defeated, the three students make their escape, with Tsuyu saying that they were impressive. After defeating the villains at the Flood Zone, Izuku, Minoru and Tsuyu successfully escape the Flood Zone. Tsuyu wonders what their next course of action should be with Izuku suggesting that they should try and call for help. Tsuyu then notes that their teacher Shouta is fighting a large group of villains in the Central Plaza. Izuku then says that they should watch their teacher battling and when there are openings, they should jump in and help in order to relieve their teacher's burden.

At the Landslide Zone, Shouto Todoroki easily defeats the villains there by freezing them all.

At the Mountain Zone, Denki, Momo and Kyouka battle the villains there. Momo creates an insulator sheet to protect herself and Kyouka, allowing Denki to discharge a great amount of electricity, which electrocutes all the villains, defeating them.

At the Central Plaza, Shouta continues fighting the villains and finally faces the ringleader, Tomura Shigaraki. Shouta manages to strike Tomura, but Tomura grabs Shouta's elbow and starts disintegrating it. Shouta punches Tomura and knocks him down, then defeats two villains to attempted to attack him. Suddenly, a monstrous villain appears behind Shouta.

Near the exit of the USJ, Kurogiri and Thirteen battle. However, Kurogiri defeats Thirteen by warping Thirteen's Quirk against himself, causing Thirteen to start turning to dust, which incapacitates Thirteen. Tenya begins running towards the exit with Kurogiri in pursuit. As Kurogiri appears before Tenya, Mezou jumps into Kurogiri, stopping Kurogiri and allowing Tenya to continue running towards the exit.

Izuku, Tsuyu and Minoru reach the Central Plaza, but are shocked to see that their teacher Shouta is severely wounded and on the ground due to being defeated by the monstrous villain. Tomura asks the Heroes to tell All Might that he is wanted by Artificial Human "Noumu".

At the Ruins Zone, Katsuki and Eijirou defeat the villains that are there with Katsuki commenting how weak they were. Eijirou decides that they should go help their classmates, with Katsuki declining his plan and instead wants to beat Kurogiri, saying that he is the Villain Alliance's gateway and defeating him will put the Villain Alliance at a disadvantage. One of the surviving villains try to attack Katsuki from behind, but Katsuki knocks out the villain with an Explosion. After seeing Katsuki's manliness, Eijirou decides to go with Katsuki. Near the exit of the USJ, Tenya is about to reach the exit, but Kurogiri once again impedes in his path. As Kurogiri is about to cause Tenya to warp away, Ochako grabs onto Kurogiri's plates around his neck (after surmising that those plates are part of his real body) and uses her Quirk to make the plates float, causing Kurogiri to go into the air. Tenya reaches the exit, goes through it and dashes off to Yuuei. After being flung into the air, Kurogiri decides to warn Tomura and warps himself away.

The League of Villains's Upper Hand: All Might Appears!
At the Central Plaza, the severely beaten Shouta tries to get up but Noumu pins him down. Kurogiri appears before Tomura, telling him that Thirteen is defeated but he could not stop one of the students from escaping, much to Tomura's frustration. Realizing that the escaped student will most likely go and find dozens of Pro Heroes whom they won't be able to defeat, Tomura decides to retreat.

However, after seeing Izuku, Tsuyu and Minoru, Tomura says that before they retreat, they will knock the Symbol of Peace's pride down a notch and attacks the students, grabbing Tsuyu's face but isn't able to disintegrate her as Shouta uses all his remaining strength to nullify Tomura's Quirk before being pinned down again by Noumu. Izuku attacks Tomura although Noumu intercepts it. Izuku notes that his punch was successful but realizes that it had no effect on Noumu.

Izuku and Tsuyu get into a brief scuffle with Tomura and Noumu. Suddenly, the doors of the USJ burst open, revealing All Might in the flesh, telling everyone to have no fear since he has arrived, much to Class 1-A's happiness. Tomura decides to continue their mission.

All Might says that he knows what is going on due to running into Tenya along the way. All Might rips his tie and takes off his blazer. All Might uses his super speed and instantly defeats the remaining villains in the Central Plaza, then goes to pick up the beaten Shouta. Using his super speed again, All Might rescues Izuku, Tsuyu and Minoru from the clutches of Tomura and Noumu. All Might then puts them down at a safe distance, telling the three to go to the entrance and leaves Shouta in their hands. Izuku tries to warn All Might about Noumu but All Might tells him it is all right.

All Might vs Noumu
All Might begins his battle with the Villain Alliance, attacking Noumu with Carolina Smash, but Noumu retaliates with a punch but All Might dodges it and hits Noumu with a punch. All Might realizes that his attacks are having no effect. All Might grabs Noumu and uses a supplex on Noumu, smashing Noumu into the ground. However, Kurogiri intervenes, using his Quirk to save Noumu and allowing Noumu to turn the tables on All Might by grabbing onto his weak spot. Kurogiri prepares to carry out his duty to eviscerate All Might. Izuku, seeing All Might in trouble, decides to help his mentor and rushes to him. Suddenly, Katsuki appears, using an Explosion on Kurogiri and then grabs his plates which pins him down. Shouto appears and freezes half of Noumu's body and Eijirou tries to attack Tomura but Tomura dodges him.

Thanks to Shouto freezing half of Noumu's body, All Might escapes from Noumu's grasp. Katsuki continues to hold Kurogiri down, warning him not to try anything funny. Tomura orders Noumu to take out Katsuki and recover their gateway. Noumu gets up from the ground but his frozen half shatters in the process. However, Noumu starts to regenerate his wounds and returns to normal. Noumu attacks Katsuki, but All Might protects Katsuki from Noumu's attack. In the process, Kurogiri is freed from Katsuki's clutches and returns to Tomura's side. After seeing All Might protect Katsuki,Tomura begins to talk about violence; that both Heroes and Villains use violence to protect their respective comrades. He continues to say that the title "Symbol of Peace" is nothing more than an oppressive form of violence, accusing All Might of using the title to create more violence, but All Might calls it rubbish. All Might and Noumu attack each other and engage in a fist fight. All Might decides to surpass his 100% after seeing that his attacks are having minimal effect. All Might launches a devastating punch against Noumu, sending Noumu flying out of the USJ, defeating him. Tomura starts to tear up.

Game Over for the League of Villains
At the Mountain Zone of the USJ, Denki is suddenly taken hostage by one of the villains who were unaffected by Denki's discharge, forcing Momo and Kyouka to surrender as they can do nothing now that one of their classmates have been taken hostage.

At the Central Plaza, All Might has defeated Noumu. All Might asks Tomura why he is not going to fight as it is his mission to kill him. Tomura starts panicking as without Noumu they have no chance against All Might. Kurogiri tells Tomura to calm down as Noumu has dealt significant amounts of damage to All Might, saying they still have a chance to complete their mission. Tomura regains his composure and decides to finish what Noumu started. Kurogiri and Tomura charge at All Might (who is unable to move due to Noumu causing him too much damage). Izuku uses One For All on his legs and jumps towards Tomura and Kurogiri in order to intercept them. As Izuku prepares to clash with Tomura and Kurogiri, Tomura is hit by a gunshot, causing him and Kurogiri to stop their attack on All Might.

At the Mountain Zone, the villain holding Denki hostage is shot down, freeing Denki. It is revealed that the gunshots came from one of the Yuuei Pro Heroes that have arrived to help along with Tenya who called them to help. Now that the Yuuei Pro Heroes have arrived, Tomura declares that it is officially game over for them. Surprisingly, the heavily damaged Thirteen shows up, using his Black Hole on Kurogiri and Tomura. Before being sucked away by Thirteen, Tomura says that although they failed this time, they will definitely kill All Might next time. Both Kurogiri and Tomura are sucked into oblivion.

Class 1-A's Victory: The League of Villain's Defeat
The defeat of Kurogiri, Noumu and Tomura ends the Villain Alliance's attack with Class 1-A as the victors. Izuku laments that he was unable to do anything, but All Might cheers Izuku up, saying that if it wasn't for Izuku, he would have been dead.

The Yuuei Pro Heroes decide to go and check the conditions of the students and the teachers that fought the Villain Alliance. Eijirou goes to see if Izuku is all right, but the Pro Hero Cementoss creates a cement wall to stop Eijirou from seeing All Might's true identity, Cementoss tells Eijirou that the Yuuei Pro Heroes want to check the students for injuries, telling him to go to the front gate of the USJ along with his classmates. All Might thanks Cementoss for concealing his identity, to which Cementoss replies that they should head to the infirmary to have his wounds treated.

At the Villain Alliance hideout, a portal opens up, with Tomura exiting it as well as Kurogiri. They both survived due to Kurogiri warping himself and Tomura just before they were sucked into oblivion and thus saved themselves from being killed. Tomura is on the floor groaning about his body hurting, moans about Noumu being defeated and his subordinates being routed. Tomura further complains that All Might is still alive and tells someone that he was wrong. On the blank monitor, a mysterious person tells Tomura that he wasn't wrong and that he was simply over optimistic. The mysterious person asks where Noumu is. Kurogiri regretfully informs that he could not locate Noumu's coordinates and thus he couldn't save him. The mysterious person says that it is too late to mourn and that they should gather a new group hand picked for efficiency, saying that they should take all the time they need. The mysterious person says that Tomura is a symbol of importance and that next time he will show the world the horror of his existence.

Bright Future for the New Generation of Heroes
Outside the USJ, Class 1-A have gathered to see if they have any injuries, but it is revealed that everyone (except for Izuku) is uninjured. Class 1-A begin speaking amongst themselves about their experience in facing villains. Tsuyu asks a detective called Naomasa Tsukauchi how their teachers and Izuku were doing, to which he replies that they are in critical condition but are not in any life-threatening positions. As Naomasa leaves for the infirmary, one one of the policemen say that they have apprehended a suspect 400 meters from the USJ.

At Kango's infirmary, Naomasa arrives and tells All Might that Shouta and Thirteen will be all right. He then says that if it wasn't for them, the children would have been most likely severely injured. However, All Might says that the students fought bravely and made the villains look like fools, saying that Class 1-A will make fine Heroes.

One Battle Ends, Another Battle Begins
The next day in Class 1-A, Tenya tells his classmates to be seated. To everyone's surprise, Shouta walks in bandaged all over. He tells his students to not worry about him and that the battle hasn't really ended for them, saying that their next battle is the approaching Yuuei Sports Festival.

Story Impact

 * Tenya Iida becomes the Class 1-A president while Momo Yaoyorozu becomes the Vice-President.
 * All of Class 1-A get their first real life experience of the world of Pro Heroes.
 * All Might starts to weaken dramatically.
 * One of the major antagonists, Tomura Shigaraki is introduced.
 * The organization that Tomura is from, the League of Villains, is also introduced and the mission of the villainous organization is to kill All Might.
 * The mysterious individual that Tomura seems to regard as the leader, Sensei, is shown through voice.
 * Izuku has his first fight with a villain with assistance from his classmates and wins.
 * Izuku uses One For All for the first time without damaging his body. He believes he did this by reflexes.
 * The first villain as strong as All Might, Noumu appears.
 * It is revealed later on that Noumu is an Artificial Human experimented on by the League of Villains.

Characters Introduced

 * Shigaraki Tomura
 * Kurogiri
 * Noumu
 * Thirteen
 * Inspector Tsukauchi