Yui Furukawa (古川 ゆい, Furukawa Yui) Voiced by: Yukari Aoyama (game), Akane Tomonaga (anime) A first-year student in class A and primary heroine who has transferred into Uchihama Academy recently. She joins in the Astronomy Club after she meets Sō. Yui is an artificial intelligence created from an AI Unit research project, sent into the past (October 1) multiple times by Sō to save Kaori from an impending accident at the beginning of the series.