What is Grief, if not Devilish? [OMORI x Chainsaw Man]

[COVER ART NOT MINE/IS A PLACEHOLDER TILL I CONVINCE MY SISTER TO DRAW SOMETHING FOR IT!]

[The Crossover no one asked for, yet I delivered anyway! Sue me! (no, don't actually, please!)]

So... there he was, falling to his death, with no memory as to why he was falling. When he did hit the ground, though, and when the pain was done coursing through his body, and when he did finally die... Sunny Suzuki was greeted with a white expanse, and in front of him was... Mari? Or... was it?

All he knew, was that he was now alive again, with a purpose back in his life to right his wrongs, and with a new mission given to him by Mari(?), he wasn't about to screw up for a second time.

But first, he had to find out what the hell a "Devil" was. And... why he suddenly could sprout chains out of his body...