Daisuke Suzui, the scion of a local hospital, was spoiled by his father and lived a depraved life while being an exam student. Mr. and Mrs. Kuroki who moved in next to such Suzui. One day, Kotone, who visited Suzui's house, was pushed down by Suzui, who had failed her exam and was desperate. However, Kotone encourages Suzui, believing that he is an obedient young man at heart. Then Suzui started working with Kotone as encouragement. Wanting to respond to her Suzui's feelings, Kotone ran a pen on a false letter addressed to her husband while worrying about her chastity idea.
