Naomi, a high school teacher, feels lonely living alone, so she secretly begins living with her student Keiji. It could be said that she is providing for Keiji as an outlet for her sexual desires rather than living together. Naomi, who has a natural lewd blood in her veins, knows that Keiji's older brother, Keisuke, is passionate about her, so she immediately decides to have a relationship with him. One day, Keiji gets fed up with Naomi and disappears...