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Hachiouji Shizuku is Shinagawa Daichi 's rival in Oomurasaki Academy. She is the reason why Shinagawa got expelled in the elite school after having a fight against delinquents who are bullying her.
Although Daichi made a promise with Shizuku to meet again in university, his grades had already begun to slip, eventually losing interest in studies entirely and subsequently becoming a student with poor grades. This event marks his becoming a delinquent and his changed look (he previously had black hair and wore glasses).