The story explains the day-to-day of a college freshman just starting a new life in the School of Literature Department of Tama University. While he grew up with his sister, he left and lived by himself when she got married with a man who had two daughters from previous marriages. He tried to distance himself from that family and so he moved out to live on his own. About 3 years later he was asked by his sister to visit and babysit the girls which suddenly turned his life upside down when the girls` parents went missing. He now has to live with the three daughters of his sister; with which two (from a previous marriage) are not related by blood: a tsundere Takanashi Sora (14 years), a little demon Takanashi Miu (10 years) and a small girl Takanashi Hina (3 years). In a six tatami mat size room.
Source: Baka-Updates Manga

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