The Twitter account for Fire Force has confirmed that a season 3 TV anime is in production. You can see the official announcement below:
Atsushi Ohkubo wrote and drew the Fire Force manga, which Kodansha licensed in English. Kodansha describes the story as:
The city of Tokyo is plagued by a deadly phenomenon: spontaneous human combustion! Luckily, a special team is there to quench the inferno: The Fire Force! The fire soldiers at Special Fire Cathedral 8 are about to get a unique addition. Enter Shinra, a boy who possesses the power to run at the speed of a rocket, leaving behind the famous “devil’s footprints” (and destroying his shoes in the process). Can Shinra and his colleagues discover the source of this strange epidemic before the city burns to ashes?
The series got an anime adaptation in 2019, which had 24 episodes. David Production animated it, and they announced a 2nd season immediately in December 2019. The sequel aired in 2020, and it also ran for 24 episodes. More details for season 3 of Fire Force will be announced at a later date.
Source: Official Twitter
©Atsushi Ohkubo, KODANSHA / “FIRE FORCE” Production Committee