A Quiet Life Seems Perfect

Raito Yakamura followed strict rules in life. He believed in discipline, being efficient, and keeping control. He used to work as a mercenary but left that violent life behind for a peaceful civilian life. Everything changed, though, when he met Kurai, a clever and mysterious demon, and his world turned upside down. Kurai is not just a voice in his mind; she wakes up new powers inside him. She makes him stronger, quicker, and offers him abilities that are beyond human limits. But with this power comes a tough truth: he is no longer just Raito.