Sayaka Komaki is a girl living an ordinary school life. She secretly has a crush on Shindo， a student in the same grade. But her peaceful life changes when one of the school’s basketball club members suddenly disappears. And she meets a new girl in school， mysterious Setsuna， who moved in around the time the student went missing. Something inside Sayaka begins to change after meeting this new girl in school. Who is this Setsuna? Lovesick Sayaka and obsessed Shindo complicate the story， trying to get what they want. Egotistical people can be manupulative. The truth can only be seen through purity，Setsuna’s blade.