Chainsaw Man 

Before Chainsaw Man 

by Tatsuki Fujimoto

A collection of short stories written by the mangaka who brought you Chainsaw Man.

Chainsaw Man

by Tatsuki Fujimoto

Denji, a kid left with his father's debt is robbed of a normal teenage life, having to work to pay this debt along with his chainsaw devil pet Pochita. Working for Yakuza to pay off the debt, he is then betrayed and killed by them, Pochita and Denji make a contract fusing them together as one, this allows Denji to be reborn as CHAINSAW MAN.