At Seidoukan Academy, Ayato Amagiri, a young male Genestella, grabs a handkerchief dropped from a dormitory window. When Ayato returns it to its owner, Julis-Alexia von Riessfeld, he inadvertently discovers her putting her clothes on. Julis challenges Ayato to a duel, but the duel is interrupted when the Seidoukan student council president, Claudia Enfield, intervenes as Ayato is not yet officially enrolled at Seidoukan. Ayato and Claudia discuss his sister Haruka, who has disappeared and led Ayato to transfer to Seidoukan. Ayato is introduced to the class. After school, Lester MacPhail challenges Julis to a duel.