[Machine Translation] A fifty-story tower apartment building that was built just last month. On my way home from shopping, I, Jin Araki, a high school student, looked up at it with my younger sister, Mai. Mai, who adores fairy tales, describes the condominium as looking like a castle. If it is a castle, there must be a princess. I want to meet the princess... Mai murmured. But I know. A princess is nothing to do with us. I thought so, but the world is not as simple as I wished. I met Rei Madou, one of the residents of the castle, by chance. And then I found out. The Rei in front of me is not a princess, not the idol of the school. The long-awaited book version of the popular web-based coming-of-age story, with newly written episodes!