ERI INCIDENT : THE SHIE HASSAIKAI RAID
The
Shie Hassaikai arc is centered around the Yakuza organization of
Kai Chisaki, also known as
Overhaul, who plans to eliminate the world of quirk with the help of quirk-erasing bullets prepared from Eri's quirk, Rewind.
Eri is a young girl with a quirk who can reverse living bodies, and she has been cruelly manipulated to his advantage by
Overhaul.
Mirio Togata and
Izuku Midoriya (Deku) with Sir
Nighteye eventually come across Eri while on patrol, and although something is amiss, they permit Eri to go back to Overhaul because of the manipulative persona that troubles them and
challenges the heroes to rescue Eri.
A joint raid headed by heroes like Fat Gum, Ryukyu, and Eraser Head with U.A. students Deku, Mirio, and Kirishima must rescue Eri and thwart the Shie Hassaikai. On the mission, Mirio gallantly fights Overhaul but loses his quirk with a quirk-erasing bullet. He continues to protect Eri and shows the highest heroism. Later, Deku arrives and uses One For All at 100% after healing from Eri's Rewind quirk and rescues her, overpowering Overhaul. However, the war toll takes a great turn: Sir Nighteye gets mortally wounded, and he realizes only before he dies that Deku is One For All true successor. Meanwhile, during the occasion, Overhaul gets crippled by Shigaraki Tomura as well as the League of Villains who has betrayed him since they acquired quirk-erasing bullets. In the aftermath of the events, Eri is freed and continues to remain under the care of Aizawa and Deku. Slowly, she begins healing and, with the education given by Aizawa regarding quirk usage, learns about controlling her quirk.