The Only Thing They Fear (Killer in Chainsaw Man)

Killer AUs are something notorious throughout all of the Multiverse. Hated, but more often, feared by the masses of every AU. You could never tell what was on their mind as they are incapable of properly expressing them because of the emotionless mess they are. And with their reputations for killing whatever they can get their knife to sink into, it was easy to see why they were an "execute on sight" threat.

During the events of Ten no Kami breaking into the Multiverse with the intent to conquer it, and the whole thing with Samson shaking reality so violently, nearly fracturing it, one Killer, in particular, fell out of the ruptured reality, falling into something completely different.

With no one to lead him, he only wonders what happens now that he can't return. That was, until, he met some guy with a chainsaw...dog?