Bandai Toys: Anime Heroes - Chainsaw Man

Denji is the protagonist of the Chainsaw Man manga series. Young Denji is burdoned with the debts of his late father, so he and his superpowered pet dog Pochita take up dangerous devil hunting gigs for the Yakuza. When a job goes badly wrong, Pochita, revealed to be the Devil of Chainsaws, replaces itself with Denji's heart, transforming him into Chainsaw Man. Later he is saved as wehn Denji gets brutally murdered on a job, Pochita becomes Denji's heart, eventually catching the attention fo the Public Safety Devil Hunter Makima, who recruits him for her organisation, finally giving him a purpose for life.