Haruhiko takes a new job as an art teacher, at first only part-time. At school he meets Chitose, the younger sister of his ex-girlfriend Mariko, again, that he admits to being in love has always been in him. A major risk is associated with this, to form a relationship with one of his students, he nonetheless agrees to the plan. In general, he is an affable, empathetic young man, but in bed, he shows a different side of himself. Which makes his character is more dominant and he finds pleasure in Chitose to bring in humiliating situations, later calls even as his slave. Where she also insists that she belongs to him alone, and he will deal with it as he pleases. Although he says the vows, he finds in Tagami-sensei short time later, another person who would be willing to engage in this kind of relationship, and now he has Chitose collected so far that they even eventually agrees.