When his father died, Denji was stuck with a huge debt and no way to pay it back. Thanks to the help of a Devil dog he saved named Pochita, though, Denji is able to scrape by as a Devil Hunter working for the Yakuza. When the mob betrays Denji and he's killed by a Devil, Pochita sacrifices himself to revive his former master. Now Denji has been reborn as some kind of weird Devil-Human hybrid. He is now Chainsaw Man!