Devil in your heart: Deal with the Devil [Chainsaw man x OC fanfic]
Thirteen years ago, the world used guns as a countermeasure for devils. But some people abused this power. Leading people to fear, and increasingly, guns. This led to the birth of the Gun devil. (this is a chainsaw man fanfic, this will be a lot different from the canon chainsaw man route. And I'm shit at fanfics. So...