Fire Force Season 1 Part 1 contains episodes 1-12 of the anime directed by Yuki Yase.
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 among them, but his past leads him down a different road—a path marked with the Devil’s Footprints.
Fire Force: Interview with Atsushi Ohkubo at Anime Expo 2019
Fire Force: Atsushi Ohkubo Speed Drawing at Anime Expo 2019
Fire Force Inside the Episode