Hell's Villain (Chainsaw Man x Male Reader)

"This... is a contract." "You... will become a part of me..." "And in return..." "We will strike fear into the heart of the Control Devil."

The Tenth Pillar. (Kimetsu No Yaiba X OC)

The Demon Corps always fight the demons. The Pillars are the most powerful swordsmen, nine in total, but by orders of Oyakata-sama a new Pillar is assigned.