Demon Slayer: Breath of the Night

The System provided the power. It didn't provide a conscience. Reincarnated in a Japan where the Demon Slayer Corps fight for humanity's dawn, a new hunter stalks the night. However, he seeks not to protect, but conquer. His call? Greed, not righteousness. Demon slayer fanfic? Check. System? Check. Villain MC? Check. AU? Check. Disclaimer: I own nothing and do not commercialise this story in any way. This is a fan-created work based on Koyoharu Gotouge's Demon Slayer: Kimetsu no Yaiba.