 Now, many years later, Yuri, who has since married, asks Yuuta to babysit her daughter, Hina, and two step-daughters, Sora and Miu Takanashi, while she and her husband go on a trip.Unfortunately, the plane Yuri and her husband are on crashes and they are both reported missing and presumed dead.A similar event unfolds, and in order to prevent the girls being separated from each other, Yuuta takes it upon himself to look after the girls in his small apartment, thus begins Yuuta's story of sharing his everyday life with his three nieces.