Denji is the main protagonist of the anime and manga 'Chainsaw man',  When Denji was young, he ended up inheriting his father's debts from the Yakuza. After meeting his demon dog 'Pochita', Denji becomes a devil hunter to pay off the debt... but is betrayed by the Yakuza and dies, pochita becomes denji's heart, causing denji to revive and become the 'Chainsaw man', After meeting Miss Makima, Denji becomes a public security devil hunter, as a member of Tokyo Special Division 4.