One day after school, Kaede, the student council president and Hayato, the secretary, are summoned to the student council room by Kaede's twin sister, Suzu. Kaede is curious about the mysterious box on the desk and when she puts her hand in it, her hands are restrained... Today is the day of the school festival and the main character's class is going to have a maid cafe and the girls in maid uniforms are very active. Of course, his classmate Kaede is also serving customers in a maid outfit, as usual. Then for some reason, Suzu, who had come to visit him dressed as a maid, offered him a mysterious switch. Kaede suddenly starts writhing in agony when I turn on the switch to try it out. Apparently, the main character pushed it, it leads to a rotor that is inserted into Kaede...