Description from Google Books:

Broke young man + chainsaw demon = Chainsaw Man! Denji was a small-time devil hunter just trying to survive in a harsh world. After being killed on a job, he is revived by his pet devil Pochita and becomes something new and dangerous—Chainsaw Man! To live life as a normal high school student, or to become Chainsaw Man again. Denji is facing the ultimate choice and has no idea what to do. Meanwhile, a mysterious group called the Chainsaw Man Church is gaining power behind the scenes. What exactly are they plotting, and how will Denji fit into their scheme?

Snippet from Google Books:

Broke young man + chainsaw demon = Chainsaw Man!