Public Safety Saga

Public Safety Saga (公安編 kōan-hen) is the first part of the Chainsaw Man series. It follows Denji as he spends his days working as a Devil Hunter at Public Safety. Part 1 was serialized in Weekly Shonen Jump from 2018 until 2020.

Denji is a lonely boy who one day meets a Devil, Pochita. The two end up becoming friends, however Denji is soon killed and to save him, Pochita becomes his new heart, making him a human-devil hybrid and allowing him to become the Chainsaw Man. Soon after that, Denji meets Makima and decides to follow her and join the Public Safety and become a Devil Hunter. At his new job, he makes new friends, like Aki Hayakawa and Power, and together they go on a different missions to exterminate devils. Eventually, Aki and Power are killed and Makima is exposed to be the Control Devil, who wants to control the Chainsaw Devil. Denji is then forced to fight and defeat Makima and her new squad of hybrids.