Tohma Shiratori, the older brother, is a well-received popular teacher at school, but in order to force himself to act such an appearance he's in competent in front of his sister. Chiyuki Shiratori, the younger sister, is a delinquent school girl who just sleeps during classes, but at home she takes care of her brother and does cleaning, laundry, and cooking. A story about an older brother who wants to be kept, and a younger sister who wants to take care of him.