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.Yuuta Segawa, a college student, suddenly becomes the guardian of his three nieces in place of his sister and her husband. The eldest niece, Sora, is a 14 year old middle school student with semi-long brownish hair decorated with a ribbon. The middle niece, Miu, is an elementary schoolgirl with blond pigtails. The youngest niece, Hina, is an angelic 3 year old attending daycare. This at-home romantic comedy illustrates the chaotic but heartwarming lives of these four characters in their tiny one-room apartment.