Protagonist Yahiro has recently come to live alone with his younger sister due to his father’s work. Currently his days are packed with leftover work from moving houses and with the transfer procedures for his new school. So when he and his sister suddenly find a huge truck in front of their house they expect it to contain leftover furniture from their previous home.
But when they opens the door to the house they find an unknown girl in their house, and believe it or not, she’s all down to her underwear!? When they both let out cries of surprise the girl notices them and shoos them out. Moments later she opens the door and apologizes for her rudeness. She then says that she’s Yahiro’s sister and that she’ll be living in the same house from then on. Oh and between words she also mentions that she is a princess. Still stunned by her sudden appearance, what will happen to Yahiro’s life?
