Chainsaw Man, Vol. 21 by Tatsuki Fujimoto

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!

In order to escape the Aging Devil, Denji begins eating everything around him. Does he actually have a plan or is he just hungry? Denji and Yoru will have to work together if they hope to get out alive!