Tanktop Master/Synopsis

Alien Conquerors Arc
Tanktop Master is first shown at the S-Class Hero Association meeting. There, he recognizes Saitama's name, but is unable to recall where he had heard it.

During the alien invasion of A-City, Tanktop Master attempts to assist Tatsumaki in defeating the alien spaceship, but backs out when he realizes that he was utterly outmatched by Tatsumaki's psychic powers.

Hero Hunt Arc
Tanktop Master appears assisting his brothers and Mumen Rider against Garou. While battling and holding an edge over Garou, Tank Top Master has a somewhat fishy and familiar feeling about Garou, having his instincts tell him to finish Garou off because of Garou's villainous aura. This continues until Mumen Rider stops him from finishing Garou because Mumen Rider believes Garou has already taken enough of a beating. Although his brothers disagree, Tanktop Master agrees and allows Mumen Rider to tell Garou not to hunt heroes again. However, Garou chooses not to stop, stating his plan hasn't changed a bit. This leads to Tank Top Master attacking Garou again, but this time Garou decides not to hold back. No longer holding back, Garou manages to easily subdue Tanktop Master with his techniques. Afterwards, Garou reveals his identity to Tanktop Master. Tanktop Master and Mumen Rider attempt to stop Garou from brutally injuring Tanktop Master's brothers. Unfortunately, they are no match against Garou's Water Stream Rock Smashing Fist. Tanktop Master's brothers attempt to stop Garou on their own but are easily beaten down as a result. At the hospital, he's in the same room as Mumen Rider who was being visited by Saitama, who starts discussing Garou's appearance and abilities. Later, Tanktop Master joins the discussion, stating that it was Garou's fluid technique that made him so well-suited to fighting the heroes, who were otherwise more used to monsters leveraging their brute force to bring about destruction. Saitama recalls Tanktop Master's name, but only remembers him as "the guy who got beaten the hardest", much to Tanktop Master's annoyance. Tanktop Master then goes into detail about Garou's ability to turn a hero's power back on himself, no matter how much power he may possess, causing Saitama to be excited at the prospect of fighting a worthy enemy.

Super Fight Arc
The hospital where Tanktop Master and Mumen Rider are staying at is attacked by the monsters from the Monster Association. While protecting patients Mumen Rider is injured by the monster Gyoffrey and Tanktop Master saves him just in time by blowing the monster away with his Tanktop Tackle.

Monster Association Arc
Tanktop Master later finds Mumen Rider getting on his bike outside the hospital. He states that Mumen Rider is pushing himself overboard yet again before offering his own help to the Z City crisis, explaining that he felt the need to start from square one after being shown up by Tatsumaki and Metal Knight. As he gets on Mumen Rider's bike, he compliments him on his spirit, commenting that he has a "tanktop on his heart" as the two of them approach Z City. Tanktop Master eventually decides to travel to the site of the battle, wishing Mumen Rider and the other heroes good luck before throwing a cell tower and grabbing a cable attacked to it as a means of travel to the raid. As he arrives, Tanktop Master asks how the situation is and is surprised to see Zombieman and Atomic Samurai acknowledge and welcome the hero to the battle. He and the other heroes on the surface decide to cooperate and devise a plan to defeat Psykos and Orochi. Eventually, the plan is put into motion as Tanktop Master hurls several large rocks at the fusion, thanking Fubuki for enhancing his tanktop powers despite her not actually doing anything to the tanktop. When Genos and Drive Knight engage in combat with Psykos, Tanktop Master throws a building containing Superalloy Darkshine, Puri-Puri Prisoner, and Atomic Samurai at her. He is later seen with Pig God as they jump out of the way of Homeless Emperor's energy blast, and Pig God subsequently saves him from Gums, who attacks them from underground. Tanktop Master is later seen in the fight against Gums as he struggles to not let Gums chomp down on him until Pig God tackles the monster so that it can spit him out. However, he and Pig God witness as Fuhrer Ugly takes a member of the Narinki's Private Squad hostage and rips his arm out. As he is distracted by the ugly monster, Gums takes the opportunity to try and eat Tanktop Master again, this time chomping down on him more successfully. As Tatsumaki temporarily distracts Fuhrer Ugly by stopping the monster from killing the Narinki Squad member, Tanktop Master is once again rescued by Pig God tackling the gluttony monster, freeing him from it. He then prepares to throw Pig God after the fat hero puts the Narinki Squad along with Bushidrill and Okamaitachi into his mouth to prevent any more hostages. Before launching Pig God, Tanktop Master tells him to pass on a message to Mumen Rider that the heroes will win. He then charges at Fuhrer Ugly with his Tanktop Tackle after the monster just broke free from Tatsumaki's restraining and knocked her back, only to be met by a powerful punch from the monster that shatters both of his forearms. He is then severely injured by Fuhrer Ugly punching him into the ground. Semi-conscious after Fuhrer Ugly's first punch, Tanktop Master hails the invincibility of the tanktop, before again being mercilessly brutalized by the monster. Left in a bloody pulp, he is ultimately taken by Gums into its mouth. Soon after, Bang arrives and rips a hole through Gums' stomach with a kick, saving Tanktop Master from the gluttony monster and Fuhrer Ugly. As he is presumed dead with no heartbeat, Bang and Genos try to resuscitate him, with Bang attempting to remove his tanktop to let Genos defibrillate him, but his grip slipped. Tanktop Master's tanktop snaps back on to his body and acts as a defibrillator, restarting his heart and reviving him through what he called "Tank Top Magic". He is then being carried by Bang to Fubuki's whereabouts in order to heal his injuries. Fubuki is then able to heal Tanktop Master by donating some of Bomb's life energy, giving him just enough power to begin healing on his own.

Neo Heroes Introduction Arc
Tanktop Master is seen talking with the remaining members of the Tank Topper Army about the current state of affairs.

Neo Heroes Uprising Arc
Tanktop Master is dispatched to take on the Dragon-level Mysterious Being Heavy Smoker in N-City. He thinks to himself that due to the suffocation effect of the Attack Specialized Tight Tanktop, he only has three minutes to secure a victory.

After battling Heavy Smoker to a standstill despite the poisonous smokescreen, Tanktop Master's legs succumb to the poison, rendering him unable to keep fighting. As the injured Heavy Smoker prepares to attack, Tanktop Master resolves to rip his tanktop, use Tanktop Deep Breath, and absorb the poison to save the city. Before he can do so, Flash intervenes and attacks the monster, driving it back. Though Flash finishes off Heavy Smoker, the duo are unable to save the city from the poison.

Tanktop Master and Flashy Flash withdraw from the poisoned city, and Tanktop Master is sent to the hospital, where he's expected to recover quickly.