Masaki Mizushima/Synopsis

Vigilantes Beginnings Arc
After a sudden villains outbreak, where several innocent people were turned into Instant Villains, Tanuma organize a meeting with several of heroes. In addition to Manual, Best Jeanist, Shota Aizawa, Death Arms, Snipe, Thirteen, Endeavor, Airjet, Midnight, Ingenium and Gunhead were called into the meeting.

Together, they spoke about the victimized civilians injected with the Trigger drug and how to help the unwilling civilians injected with the drug. After the meeting, the heroes returned to their daily chores.

Sky Egg Arc
On the occasion of Captain Celebrity's return to the United States, Makoto Tsukauchi decides to organize a farewell show at the Tokyo Sky Egg, inviting several of Japan's most famous heroes to participate. Manual is one of them.

However during the event, the Tokyo Sky Egg is attacked by creatures known as Bombers, sent there by villain Number 6 to assassinate Captain Celebrity. Manual is one of the heroes who did not go out to fight the creatures but stayed inside to reassure the spectators and help keep calm during the crisis

In retaliation for the heroes' intervention, Number 6 causes a Bomber to self-destruct in a large explosion, causing the building to collapse. Fortunately, All Might arrives in time to avoid catastrophe, saving thousands of lives.

Vs. Hero Killer Arc
Following the U.A. Sports Festival, Manual sent Tenya Ida and the internship opportunity at his very own Hero Agency in Hosu City. Tenya accepts, and on the first day of their field training, Manual takes Tenya out on patrol. He tells Tenya that he is very excited to be mentoring Ingenium's younger brother, and is confused as to why Tenya would not have chosen a more famous hero to intern with.

When they return to Manual's office at night, he tells Tenya that the city remains on high alert so the criminals have been reluctant to come out. When they patrol Kyoto together the next day, Manual admits that he knows Tenya only chose his agency to avenge his brother.

The Hero Killer: Stain attacked Ingenium in Hosu City, and Manual was able to deduce that Tenya only wanted to intern in Hosu to go after him. He says that he's glad Tenya chose his agency, but he also informs Tenya that he shouldn't be pursuing personal grudges. He goes on to lecture Tenya about the regulations on Quirks, and states that a hero must not use their Quirks for themselves because if they did, it would be a very serious crime. Tenya replies that he understands, and so Manual lets it go and they continue patrolling.

When chaos ensues in Hosu and buildings start going up in flames during their patrol, Manual receives a message that villains have appeared in the city. He responds and decides to head to the battle zone himself. He tells Tenya to accompany him, but does not notice that he has run off by himself until he arrives at the center of the destruction.

Manual and several other Pros face off against the culprits, two Nomu with incredible strength. With just the two of them, the Pro Heroes have their hands full. Manual notices Tenya is missing and calls out to him, but is forced to put his focus on fighting the fires created by the monsters. During the battle between the heroes and the monsters, Manual notices one of them about to crush a fellow hero. He calls out to her, but Endeavor arrives to save the day.

Once the chaotic incident finally ceases, Manual and Gran Torino visit Tenya, Shoto Todoroki and Izuku Midoriya at the hospital. The three of them managed to defeat the Hero Killer but were still liable to repercussions. Police Chief Kenji Tsuragamae explains all six of them including Endeavor would be punished if the incident went public.

However, Kenji allows the incident to remain confidential and thanks the boys instead. Afterward, Tenya takes a moment to apologize for neglecting Manual's advice. Manual sheds a tear, knowing he has to take responsibility as a supervisor for his negligence. He chops Tenya in the head, telling him to never do it again.

Endeavor Agency Arc
Due the increase of the villain activity, The Public Safety Commission demand all the students heroes for all academies to undergo practical field training, restarting the Hero Work-Studies program. During this second round, Manual employees Tenya once again.

Later, Tenya reveals that Manual is leading a team in Hosu, and thanks to the experience he gained during his Work-Studies with him, he has learned the art of being flexible.

Paranormal Liberation War Arc
By the end of march, Many Heroes across Japan are rallied by the Hero Public Safety Commission to take down the recently formed Paranormal Liberation Front with the merge of the League of Villains and the Meta Liberation Army. They have info about the main hideouts of the villain organization thanks to Hawks. Manual is assigned to the Jaku General Hospital raid team along with several other Pro Heroes and lead by Endeavor.

At Endeavor order, the raid begins. While one group are in charge of evacuating patients, visitors and hospital staff from the building, another group is in charge of arresting Garaki, although the situation gets complicated when he releases a horde of Nomu to escape to his secret laboratory to awakes Tomura from his stasis.

In spite of everything, the heroes defeat the creatures and assault the laboratory, preventing Dr. Garaki from awakening a Tomura Shigaraki. Facing his defeat, a heartbroken Dr. Garaki declares that the Devil's Dream has finally ended. However, against all odds, Tomura Shigaraki awakens, despite having previously verified that his heart was not beating. Seeing the situation, he immediately uses his Decay, which spreads rapidly through the laboratory, disintegrating everything in its path.

Ryukyu manages to grab Manual and get him out of there along with a few heroes before the building completely disintegrates. The decay way spreads to the nearby city, killing dozens of heroes on its way. When Tomura surfaces, several of the surviving heroes, such as Endeavor, Ryukyu, Gran Torino, and others confront him. Also the students Izuku Midoriya and Bakugo Katsuki confront him. However, Tomura is much more powerful than before, having several Quirks, including Super Regeneration.

Manual also helps as he can in the fight. In the lab escape, Eraser Head ended up with a totally shattered leg. That is why Manual, along with Rock Lock, keeps him standing so he can make use of his Erasure on Tomura, so he can't use his Quirks. Manual also uses his Quirk to wet Eraser Head's eyes so he can keep them open and on Tomura, which the Erasure Hero thanks him for.

Even with his Quirks nullified and outnumbered, Tomura turns out to be an extremely powerful enemy, and the heroes have great difficulty defeating him. In addition, Tomura is constantly moving to prevent Shota from continuing to nullify her powers. Therefore, Manual and Rock Lock carry Eraser Head to Tomura's locations as the latter tells the former to adjust his water flow accordingly.

Having enough of Shota's interventions, Tomura first throws a quirk-erasing bullet at him, striking him in the left leg, causing Aizawa to quickly cuts his it off before the drug could spread throughout his body. Then, Tomura decides to attack him, so Manual and Rock Lock rush to get him to safety, but Tomura is much faster and digs his fingers into Shota's face. Izuku yanks Tomura back with Blackwhip, but he manages to injure Shota, causing him to finally stop using his Erasure on him. With this, Tomura can use all his Quirks again, healing in an instant from all his injuries thanks to the super regeneration.

Manual and Rock Lock quickly trying to stabilize Eraser Head's severed leg to stop the bleeding, while Izuku faces Tomura. Despite being able to use his Quirks again, Tomura's body reaches its limit and begins to rip, so he decides to use his Decay to end the fight once and for all, but Izuku jumped into the air carrying everyone with Blackwhip. Realizing that his control of Blackwhip is destabilizing, Izuku puts down Manual and the other heroes down so he can face Tomura in the air and barrage attacks him with all his Ultimate Moves at Full Cowl - 100%. However, despite his best, Izuku was also reaching his limits as the Regeneration Quirk from Tomura was turning the battle into a war of attrition. Fortunately. Endeavor, aided by Katsuki and Shoto, boosts up in the air and grabbed Tomura from behind before unleashing the full blast of Prominence Burn, burning Tomura to a crisp.

Suddenly, Tomura's body was taken over by All For One who subsequently impales both Endeavor and Katsuki, sending Izuku into a furious rage that lowered his guard down, allowing Tomura to finally touch Izuku and claim his prize: One For All. Unfortunately, Tomura had failed to steal One for All from Izuku due to his body being incomplete and the strong willpower of both Izuku and the predecessors. While Manual continues to give first aid to Shota, he was subsequently surprised that his former intern, Tenya Ida arrives with more reinforcements, but he informs that Gigantomachia is rampaging across Jaku City to get to Tomura. Unfortunately, it was too late as Gigantomachia arrives with the League of Villains in his back. Luckily, Gigantomachia was collapsing from the sedative anesthesia he ingested after his battle with Class 1-A and 1-B. With Best Jeanist and Lemillion entering the battle, the tides have turned for the heroes to subdue the League of Villains, unfortunately, Tomura, along with the remaining League members, successfully escaped the battle with the Near-High End Nomus who distracted the heroes, forfeiting the battle.

U.A. Traitor Arc
In the aftermath of the Paranormal Liberation War, All For One has escaped from Tartarus, and proceeded to break into several more maximum security prisons, liberating the inmates. Due to the chaos inflicted by Gigantomachia and the mass breakout of prisoners, the whole country entered a state of total chaos and anarchy. In addition, many heroes resigned and called it quits because of the massive criticism of their work, and the destruction spreading unchecked. Manual is one of the few heroes remaining and does his best to stop the villains and apprehend them as much as he can.

Final War Arc
With the upcoming battle for the Final War, Shota has devised a plan that will lure All For One out. Knowing that All For One is keeping tabs on the Heroes through Search, he needed Yuga and the Aoyama Family to play their roles as infiltrators and spies for All For One. He and All Might recruited Shota's protégée, Hitoshi Shinso, to take advantage of Hitoshi's newest development of being able to make brainwashed people speak, by having him brainwash the Aoyamas so that they can deceive him without detecting a single lie. The next step of the plan is to make use of Kurogiri's Warp Gate to allow them to warp themselves into the fight, to catch All For One off guard, as well as warp the villains to locations all over Japan, separating them.

Neito was able to successfully copy and train himself using Warp Gate, and the heroes waited patiently for Izuku to make contact with Yuga, who was released from custody with his "lawyers". Once Yuga meets Izuku in a desolated location, All For One has finally re-emerged, and with his prize in his reach, All For One summons an army of villains to overwhelm Izuku and finally steal One For All. However, Neito uses Warp Gate to teleport the remnants of the heroes to confront the villains. Once the villains are in placed, All Might activates the Troy system trap, which ensnared many villains into cages, and the heroes shoves as many of them into the new Warp Gates created by Neito where Manual is teleported to the U.A Flying Sky Fortress. Neito activates Copy to use and cop Shota's Erasure Quirk, and looking directly on Tomura. He laughs at the villain mockingly when he has n more powers, despite Manual telling him to stop moving. Unfortunately, the plan is ultimately failing when Izuku didn't show up to face Tomura because he was caught in a different Warp Gate, teleported to Okuto Island instead, and what's even worse, Tomura begins to sprout a massive blob of fingers which hordes all over the field.

The heroes realizes that the horde of fingers Tomura sprouted is just apart of the "growth" as in case with his nails and hair, as the result of the Quirk Singularity due to his body adapting to the ever-evolving Quirks. Manual continues to keep Neito's eyes moisturized while the heroes are giving all they've got to defeat Tomura. However, Manual and the other heroes were devastated when Katsuki was killed by Tomura when he punched his chest really hard, bursting his heart. As Katsuki lays dying, Edgeshot will enter into Katsuki's heart and subsequently performs CPR using his Ultimate Move: Zenith to resurrect Katsuki, sending Tomura into a furious rage. As the result of the accumulating damage being inflicted by the heroes and the mental deterioration, Tomura undergoes another metamorphosis, transforming his body into a behemoth covered in fingers with his left hand forming the faces of his deceased family. Tomura begins to decimate the heroes one after another until Izuku finally arrives, allowing the electric barrier around the Sky Fortress to be shutdown for two seconds. Izuku slingshots himself into the battlefield and inflicts catastrophic damage to Tomura using the Second User of One For All's Quirk: Gearshift. With Tomura now reaching to the brink, he refuses to backdown.

Due the heavy fighting from Endeavor and All For One and the fiery battle between Dabi and Shoto, the weather has become even worse as a massive cumulonimbus storm that has started growing over Japan and continues to expand, combined with the tropical typhoon that begins to pick up massive wind speeds, causing trouble for Neito, Manual, and Shota. Manual stated that the upcoming wind speeds is interfering with his control of the water flow, putting them at risk of Neito blinking or adverting from Tomura once. Despite these harsh circumstances, Neito continues to endure, as he cannot afford to let himself blink once while everyone is giving it all they've got to defeat Tomura. Suddenly, Shota realizes something was off, and he turns around to see they are suddenly caught off guard, as a Warp Gate forms behind them, teleporting Kurogiri and Present Mic.