A flashback is shown with Yu, Yuko, and Kuze in their younger days as high school students. At this time, Yu and Yuko have not seen each other for ten years. In the present day, Mizuki is staying over at Renji's for the time being until she enters high school, and does not have much to do while Renji studies for exams. Renji's mother introduces Kuze to Mizuki, who discovers some of the things Renji was trying to warn her about him might be true. Mizuki and Kuze spend the rest of the day together, and the two become more familiar with each other.
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