In a girls' high school, the girls are noisy, the girls laugh and scold, and the girls exchange diaries full of their young worries and unknown secrets. There is an exchange diary between the heroes of the isolated track and field team and the talented pianist. The pianist filled his diary with secrets, and the two marginal people in the eyes of his classmates developed an ambiguous and fragile same-sex relationship. However, the track and field athlete dodged the relationship and finally broke up, which broke the pianist's heart. One day she jumped to her death from the top floor of the school. There have been a lot of strange things at school since then.
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