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Yuuta Segawa is a freshman of a university. He lost his parents when he was small and was raised by his sister Yuri. Yuuta has been living alone since Yuri got married to a middle aged man when Yuuta was a junior high student. One day, Yuri visited Yuuta'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, Yuuta decided to take in all three girls. A life of a strange family in a tiny apartment begins.