Congratulations! The 50th series! Her mother's friend Hiroka came to stay with her, remembering the sexual awakening she once felt in her, Yuzuru remembering her secret excitement. That night, Hiroka gets completely drunk while talking about her memories. She felt a pain in her crotch in Yuzuru, who had grown up splendidly, and she couldn't stand it, and she set up a night in his room. Even after that, the two of them enjoy a sweet relationship while stealing her mother's eyes. However, Hiroka feels guilty about continuing her unfaithful relationship with her friend's son...
