"Fire Force" is set in a world where spontaneous human combustion turns people into flame-wielding creatures known as Infernals. To combat this phenomenon, special fire brigades called the Fire Force are established. The story primarily revolves around Shinra Kusakabe, a young Third Generation pyrokinetic who can ignite his feet to achieve superhuman speed. Shinra joins Special Fire Force Company 8, a unit dedicated to uncovering the truth behind the Infernal outbreaks while maintaining public safety.

Shinra’s personal motivation stems from a tragic childhood incident where his family perished in a fire, leaving him with the stigma of being accused of causing it. As he integrates into Company 8, he meets a diverse cast of characters, including the stoic Captain Akitaru Obi, the devout Sister Iris, and the skilled firefighter Maki Oze. The team also encounters other Fire Force companies, each with distinct ideologies and methods, such as the militant Company 1 and the enigmatic Company 7.

The narrative delves into the mystery of the Infernals, revealing that their creation is tied to a larger conspiracy involving the Holy Sol Temple, a religious organization that wields significant influence over society. The Fire Force uncovers the existence of Evangelists, shadowy figures orchestrating the Infernal outbreaks to destabilize the world. Shinra’s journey intertwines with the discovery of his own abilities, including his Adolla Burst, a rare and powerful pyrokinetic phenomenon linked to the Evangelists’ plans.

As the story progresses, alliances and rivalries form among the Fire Force companies, with characters like Arthur Boyle, Shinra’s childhood friend and rival, and the enigmatic Captain Benimaru Shinmon playing pivotal roles. The series explores themes of faith, duty, and the nature of heroism, set against a backdrop of intense fire-based battles and intricate world-building. The plot builds toward a confrontation with the Evangelists, as Shinra and his allies strive to protect humanity and uncover the truth behind the Infernal phenomenon.