Chainsaw Man is a Japanese anime series based on the manga written and illustrated by Tatsuki Fujimoto. The story follows Denji, a young man living in poverty, who becomes a devil hunter to pay off his deceased father's debt. When Denji merges with his pet devil, Pochita, he gains the ability to transform parts of his body into chainsaws, leading to a life filled with action and horror elements. The series explores themes of survival, ambition, and humanity.