One Punch Man (Manga) Vol 21

The curtain rises on the big battle between the Monster Association and the heroes! As the Class-A and lower-ranked heroes engage in intense battle, the Class-S crew is able to take out a horde of monsters in one fell swoop before invading farther underground. Among them, Flashy Flash demonstrates splendid battle prowess against ninja turned monsters! For teen audiences. Viz Media Llc
(W) One (A/Ca) Yusuke Murata