39-year-old Nagasato Daisuke is a bachelor who works for a stationery manufacturer. Although he is attuned to trends and interacts with other people flawlessly, he hates being hurt by love. Daisuke is not disatissified with living alone. On the day he moves to his new apartment, he meets his neighbour Hanako for the first time due to an unpleasant situation. 32-year-old Kumagai Hanako is a divorced office lady. She has the clear intention not to remarry and is already preparing for old age. For some reason, Daisuke and Hanako keep quarreling right from the time they meet. But the two of them actually have many similarities. One day, Daisuke’s father Yozo suddenly visits for the first time in five years. He had secretly remarried in this time and has a step-son in tow. Meanwhile Hanako’s mother Ritsuko starts living separately from her husband and comes to live with her beloved daughter without consulting her. Daisuke and Hanako’s lives as swinging singles get disrupted because of parents who have no hesitation about enjoying their own lives.