Ep. 1: A debt-ridden teen merges with his devil dog Pochita to become Chainsaw Man after betrayal and death.

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A teenage boy burdened by significant debt is compelled to hunt devils alongside his pet devil dog, Pochita. His life takes a tragic turn when he is betrayed and subsequently killed. However, the narrative shifts unexpectedly as Pochita merges with the boy's deceased body. This fusion grants him the unique abilities and identity of Chainsaw Man, fundamentally altering his existence and setting the stage for his new reality as a hybrid entity with devil powers.