To celebrate the 50th installment of the series, this passionate story dives deep into the relationship between Yuzuru and Hiroka. Yuzuru, whose sexual awakening was sparked by Hiroka—his mother's friend—has harbored feelings for her ever since. That night, when Hiroka comes to stay over, Yuzuru gathers the courage to share his hidden emotions with her. However, as the evening progresses, Hiroka becomes increasingly intoxicated, and in her drunken state, she ends up sneaking into Yuzuru's room late at night. This series of events draws them closer, leading to a sweet and intimate night together. Yet, Hiroka begins to feel guilt over continuing an affair with her friend's son, adding emotional conflict that deepens the narrative.