Fire Force Vol. 18 (Kodansha, 2020)

Takigi Oze, detective in the army's Criminal Investigation Division and brother to Company 8's own Maki, investigates a case that takes him into the Nether. When he almost doesn't make it out alive, his father--the general--decides it's time for the army to do something about the Evangelist. The general enlists the help of the Special Fire Force, but adds one more demand: Maki must return to the military.