Spontaneous Human Combustion plagues the world, and the Fire Force are the only ones who can stop it. In their investigation, Shinra and Fire Force Company 8 confront the Evangelist and venture into the netherworld to save Shinra's missing brother, Sho.
Shinra and Company 8 have figured out the Evangelist₂s goal. After learning about his past, the hero is now more motivated to discover the truth about his mother and save Sho. But a mysterious girl reveals the Evangelist's plan; another Great Cataclysm.
A crisis plagues the world: Spontaneous Human Combustion. The only ones trained to stop these blazing mortal infernos are the brave members of the Fire Force. Shinra is determined to become the greatest hero, but his past leads him to a different destiny.