I Really Can't Solve Mysteries

A great villain who spent ten years struggling in the Main God’s space gave up everything for a chance to live again in a parallel world.

He only wanted to take it easy and enjoy a quiet retirement. But who could have guessed that this bizarre, uncanny world would be so full of danger? With no other choice, he gradually began to bare his vicious claws...

Only by being darker than all darkness and more ruthless than all the ruthless can one fear nothing!

(P.S. Paranormal fiction with a dark tone.)