That beautiful person is...

Koto, an extremely ordinary girl, is close with the most famous student at their all-girls' school, Fumi-senpai. Beautiful, talented, and seemingly "perfect," Fumi suddenly disappears as summer break comes to an end. As troubling rumors spread around the school, Koto searches for the truth behind her disappearance and comes across a certain diary… What’s written inside reveals a shocking truth about Fumi…?!