Chapter 112

What Do You Think You're Doing?! is the one-hundredth and twelfth chapter of Kohei Horikoshi's Boku no Hero Academia Manga.

Summary
In his youth, Inasa Yoarashi was a child who didn't know fear and as such whatever caught his interest became his new favorite thing. The latest trend, Heroes, caught Inasa's interest and became deeply invested in them; eventually, he developed a belief from his perspective that all Heroes have red hot fighting spirits that allow them to challenge anything head on. Inasa admired Heroes who had red hot spirits. However, Endeavor crushed Inasa's admiration of him and became to despise the flame Hero. In U.A's Entrance Exam for the recommended students, Inasa partook in a marathon. During the marathon, Inasa spotted Shouto and became interested in him after seeing his great usage of ice; although Inasa had a bad feeling coming from Shouto, he felt reassured that once they become classmates Shouto's eyes won't bother him. Inasa and Shouto reach the goal but Inasa reaches the goal by a stretch, making him the first to cross the finish line while Shouto comes in second. After the marathon, Inasa praises Shouto. However, Shouto doesn't care about Inasa's praise nor does he look at him and states that passing the exam was all that mattered to him. As he walks away, Shouto comments that Inasa is a nuisance, which shocks Inasa.

In the present, Izuku has saved Shindou from Shouto's flames and is furious with Inasa and Shouto for their impersonal bickering. Izuku's criticism stops Shouto and Inasa's stops their arguing. Shouto suddenly remembers that Inasa is the teenager he encountered in U.A's Entrance Exam; the reason he didn't recognize Inasa is because at that time he was only seeing his hatred of his father, Endeavor. After the Sports Festival, Shouto decided to forget about his for his father after reconciling with his mother. Seeing that forgetting his past isn't helping since it comes back one way or another, Shouto decides that he needs to do something else to confront his past. Annoyed with their bickering, Gang Orca appears before Shouto and uses his Repertoire sound wave move on Inasa; Inasa attempts to dodge, but he is hit by a goon's cement gun, which causes Inasa to lose his concentration and he is knocked out of the sky. As Inasa falls to the ground immobilized, Gang uses his Repertoire on Shouto which immobilizes him fully. Shouto embraces Izuku's criticism of him as his improper actions created the situation he is in now.

With Inasa and Shouto out of the way, the goons decide to go and attack a rescue group. Izuku sees the goons running toward the rescue site and decides to intercept them. Before he can, Shindou uses his Shake Quirk and crushes the ground the goons are on, stopping them in their tracks. Izuku is surprised Shindou can still move after taking Gang's soundwave move and the drawback of his Quirk. Shindou replies that he has developed a resistance to his Quirk but he is still numb. Shindou tells Izuku that it is up to him to put the goons out of commission; Izuku activates One For All Full Cowl and heads towards the goons while the rescue group continues its operations.

As Gang Orca prepares to back up his lackeys, Shouto blames himself for picking a fight with Inasa during a serious situation. Even with the odds stacked against him and the compatibility of their Quirks terrible as well as their cooperation, Shouto knows that with heat wind becomes unstable. Shouto starts producing fire from his left side and hopes that Inasa is thinking of the same idea. Indeed, Inasa is thinking of the same idea and starts producing wind. Inasa controls the wind and blows it towards Shouto. Inasa's wind scoops up Shouto's flames and becomes unstable, blowing towards Gang Orca. Suddenly, Gang Orca is engulfed by a unstable blazing whirlwind.