Sahoko Narita is enjoying the perks of finally being one of the popular girls in high school. One summer day, however, she encounters the athletic and tomboyish Aoi Koshiba and her world is thrown into disarray. Their growing friendship is tested when Aoi Koshiba confides in Sahoko about an upcoming date with a fellow classmate, Shoji Miwa. Sahoko, unable to hide her surprise, must come to grips with her own feelings for Aoi before it's too late...