[DeepL Translation - needs review] Volume 1 Introduction: Riyo, a college student, meets Kairi, who works at a supermarket where she has a part-time job. As Riyo lends a shoulder to Kairi, who is unable to sleep, she begins to develop a liking for Kairi, who reminds her of her brother whom she left when she was a child. However, she is shocked to find a diary in Kairi's apartment in which he claims to have killed a man. Who is this person she has fallen in love with? The truth that is reveal...
