Chainsaw Man, Vol. 4: The Gun is Mightier 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! Devil Extermination Special Division 4 is in serious trouble as a devil has sent a whole team of assassins to take Denji’s heart. In order to survive the onslaught, Denji, Power and Aki will have to get stronger. But is Denji smart enough to learn how to control his devil powers? Can you can teach an old chainsaw-dog-devil new tricks?