Stripped of a normal adolescence by his father's debts, Denji ekes out a living with his demonic pet, Pochita, hunting devils for the yakuza. His yearning for a simple, happy existence with good food and a loving partner is shattered when betrayal leads to his premature demise. Through a twist of fate, Pochita merges with Denji, granting him devil powers like transforming body parts into chainsaws. Recruited by the elite devil hunter Makima to keep his dangerous abilities in check, Denji strives to fulfill his fantasies of a blissful life and romance, clinging to the hope of a brighter future.