Chainsaw Man, Vol. 2 By Tatsuki Fujimoto

Broke young man + chainsaw dog demon = Chainsaw Man! Denji was a small-time devil hunter just trying to survive a harsh world. After being killed on a job, Denji is revived by his pet devil-dog Pochita and becomes something new and dangerous—Chainsaw Man! Now that Denji has found the noble goal in life of "touching a boob," the rest is easy! He just needs to defeat a gigantic bat monster before he bleeds to death. Never underestimate a motivated Chainsaw Man! But will all his sacrifices actually be worth it…?