The Humarise group adheres to the Quirk Doomsday Theory, which categorizes all quirk-possessing individuals as diseased and necessitates their eradication. Their extremist members have created a hazardous invention known as the "Trigger Bomb," which ignites uncontrollable reactions in quirk-users, leading to their demise. The worldwide deployment of Pro Heroes to capture their leader, Flect Turn, has yielded no success. During his work study with Japan's top Pro Hero in Otheon, Izuku "Deku" Midoriya is wrongfully accused of a crime. A collaboration with a local lad, Roddy Soul, places them both in jeopardy, and they are forced to flee from Humarise members. Deku, Rody, and their classmates unite to foil Flect's Trigger Bomb scheme while skillfully evading constant pursuit.