However, this average-looking guy has a not-so-average problem-he just can't seem to find an opponent strong enough to take on! The curtain rises on the big battle between the Monster Association and heroes! As the lower-ranked heroes engage in intense battle, the Class-S crew takes out many monsters in one fell swoop before venturing further underground.

Among them, Flashy Flash demonstrates splendid battle prowess against a duo of monstrous ninja!