One Punch Man, Vol. 4 by ONE

Now an officially registered hero, Saitama confronts a catastrophic meteor alongside Genos and other pros, only to be met with public scorn and accusations that challenge his legitimacy. As the Hero Association wrestles with image, rankings, and rivalries, opportunistic figures fan the backlash against him. Meanwhile, a menacing threat from the sea begins to stir, putting shelters and civilians in peril and setting the stage for bruising battles that test what it truly means to be a hero.

Purchase from Bookshop.org