Nana married her college classmate, Takashi, and lived a happy life. She lived in company housing, but she was comfortable, and the presence of her husband's best friend, Ryuichi, who lived next door to her, was also reliable for Nana. One day, she receives news of a class reunion from the club that Nana, Takashi, and Ryuichi belonged to when they were in college. Nana and Ryuichi decided to attend together, leaving Takashi who couldn't go because of work. However, what dominates Nana's head at her class reunion is not her old friend's memories, but her love for Ryuichi, who she should have abandoned once.
