帝乃三姉妹は案外、チョロい。

After the death of his mother, the celebrated actress Subaru Ayase, ordinary student Yuu Ayase is taken in by the wealthy Mikadono family and moves in with their three daughters, all of them students at Saika Academy. Kazuki is an actress prodigy, Niko a karate champion and Miwa a professional shogi player with an IQ over 180. Cooking, cleaning and quietly winning each sister over, Yuu makes a place for himself in a house where he is the only one without a gift.