Satonaka Ikkou, an apprentice Buddhist priest, is sent to live with his grandmother Kawahara Joutoku, the chief priestess of the Saien Temple. Waiting for him there are severe training, purification jobs, and six lively and quite attractive nuns. Living with same-age nuns may sounds enviable, but he is actually treated like an errand boy, since his purification skill cannot compare with theirs. However, when he has less pure, more worldly desires, his powers awaken to become quite impressive, usually saving the day.