In a superpowered society, there is nothing ordinary about evil anymore. Heroes, trained and licensed to protect and defend the public against supervillains, stand above all the rest. Not everyone can be a hero, however, and there are those who would use their powers to serve the people without legal sanction. But do they fight for justice in the shadows, or for reasons known only to themselves? Whatever they fight for, they are called...vigilantes.

After returning from an eventful trip to Osaka, Koichi starts experimenting with his Quirk--does he have more potential than he thought? Detective Tsukauchi continues to investigate the instant villain incidents, quietly enlisting the help of Eraser and even consulting All Might. And with Hachisuka out of the picture, the shadowy figure behind the Trigger drug deploys a new and even more dangerous agent...