Fire Force manga omnibus volume 6 collects volumes 16-18 in a larger sized omnibus format and features story and art by Atsushi Ohkubo, the author of Soul Eater.

Company 8 has discovered that Haijima Industries is experimenting with children to try to spark an Adolla Burst! Eager to put a stop to their deplorable practices, Shinra infiltrates their facility by agreeing to let them study his own powers. There, he's faced with a ghost from his past: Kurono, an evil pyrokinetic with twisted tendencies whose powers might be more than even this Hero can handle!