My name is “Araki Jin”. A second year student attending a high school in the city. On my way home from shopping, I looked up at the tower apartment with my little sister who had just gone to elementary school. My little sister, Mai, described a 50-story structure building that was just built last month as “It looks like a castle!”. From my POV, it looked like a cold inorganic object. ……Of course, I’m not being sarcastic. In order to satisfy my sister’s longing for fairy tales. “Maybe a princess lives here.” I say to myself. And at the same time I think, -A princess has nothing to do with us. But I was wrong. Reality is not a fairy tale. A prince can be a bad guy, and a monster can be a hero. That’s why it’s possible for me to meet the princess, Shindo Rei, who lives on the top floor of a tower apartment building. If you don’t mind, please listen. This is a fairytale story about me and Rei, but it’s not a lie, it’s reality.