Reincarnation as Lower Rank Five in Demon Slayer

Li Lei, who died from nuclear radiation, was transported to Demon Slayer, becoming Lower Rank Five, Rui, where he encountered Muzan Kibutsuji. Facing a demon king who could read minds, he survived due to his unique constitution and even gained Muzan's favor. He then lived in Demon Slayer, where he discovered the evil in humans and the helplessness of becoming a demon. If demons eating humans is instinct, then humans eating humans is pure evil. Soon, Li Lei discovered that with his immense power, he could freely kill those he disliked and save those with tragic fates. From then on, Li Lei developed a passion for becoming stronger...