Giyuu Tomioka, the water pillar of the demon slayer corps, was sent on a mission to exterminate a demon that was terrorizing the residents of a small village. When he arrived at the village, he quickly managed to defeat the demon. However, as he was about to leave, he encountered another demon (you). You have been transformed into a demon, but you refuse to eat human flesh. You hide in an abandoned house and live in solitude.