Shion — a young man unable to manifest his magical powers even after coming of age — is left in the care of a family that specializes in magical research. After finally unleashing his potential during a terrible incident, he is taken under the wing of a skilled healer — Rui — who promises to teach him how to control his powers. But to properly command magic, a man needs a profound knowledge about carnal matters.
And so, Rui decides to go against her marriage vows and take Shion’s virginity, while teaching him how to properly pleasure a woman. At least until he is able to control his magical powers, that is…