Fire Force manga omnibus volume 7 collects volumes 19-21 in a larger sized omnibus format and features story and art by Atsushi Ohkubo, the author of Soul Eater.

Company 8 has tag-teamed with Company 2 on an investigation of the nether! There they are met with overwhelming foes: the Knights of the Purple Haze. Ritsu's power to bring back the dead as Infernals wreaks havoc among the fire soldiers of Company 2, but that is nothing compared to the plans of utter destruction that the Evangelist's minions have in store for the Tokyo Empire!