Daidoji Tamotsu is a 51-years-old man. He decides to marry his girlfriend that is 28 years younger than him. One day, his girlfriend, Hanazawa Miran bring him home to meet her dad, Hanazawa Kiichiro. Tamotsu and Kiichiro are shocked when they found out that they are the same age.

Segawa Yuta is a freshman of a university. He lost his parents when he was small and was raised by his sister Yuri. Yuta has been living alone since Yuri got married to a middle aged man when Yuta was a junior high student.  One day, Yuri visited Yuta's apartment and asked him to take care of her three daughters while Yuri and her husband were on a trip. He unwillingly accepted the job but the plane Yuri took went missing. In order to prevent the daughters from being adopted separately by relatives, Yuta decided to take in all three girls.  A life of a strange family in a tiny apartment begins.