Natsuo is a highschool boy who’s experiencing the crushing despair of unrequited love. To make issues worse, the individual he’s in love with is his instructor, Hina. In an try and elevate his spirits, he attends a mixer the place he meets a lady named Rui. The two sleep collectively, anticipating by no means to see each other once more, however destiny has different plans. His life immediately turns into extra difficult when his father comes house and declares he has remarried a lady with two daughters whom Natsuo has met earlier than: Hina and Rui!