One Punch Man GN VOL 21 (C: 1-

(W) One (A/CA) Yusuke Murata. 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.