Yuuri has no children and lives happily with her husband, Koki, who tends to leave the house on business trips. One day, she hears from her neighbor, Akiko Miyashita, that she is going on a trip to Europe with her husband. She was Yuri who was envious of the elegant Miyashita couple, but she was defiant and proposed to keep Takashi, the only son of the Miyashita family, at her house. And on that day, Takashi visits Yuuri's house. She was excited about Yuuri because she had been told that Takashi was her "virgin".
