My Hero Academia: Vigilantes, Vol. 1

Koichi Haimawari couldn't make the cut to become an official hero, so he uses his modest Quirk to do good deeds in his spare time. Then one day a fateful encounter with some local thugs leads him to team up with two other unlikely heroes. None of them really know what they're doing, but they've got the courage—or foolishness—to try. But they soon discover fighting evil takes more than just being brave…

Volume 1 of the My Hero Academia: Vigilantes manga series by Hideyuki Furuhashi.