There is a high-class mansion town called "Hakuso". A place where only a limited number of wealthy people are allowed to live. The main character who spends his daily life there like a box garden, I was very eager to go to school. Meanwhile, I was informed by a letter from my parents that a tutor was coming. "It's completely different between a tutor and a school," the main character complains, but... The tutor who came was full of mysteries, but there was something strongly attracted to me. Surrounded by his love, secrets, and a cage-like house, The main character is growing up.