Yuya returns home during his university's long vacation. His heart starts to stir again at the reunion with Rin, a friend of his mother whom he has secretly admired since childhood. That night, knowing that she will be staying over, he spends a sleepless night due to nervousness. Then, drunk Rin visits his room… Unable to resist her unguarded and proactive behavior, they end up having a relationship. Although Yuya is excited about this secret between the two of them, Rin, who has been struggling with her marriage, had done it as a way to get back at her husband. After much deliberation, she decides that 'this can't go on'…
