Nana was living a happy life after marrying her college classmate, Takashi. She lived in company housing but it was comfortable, and Nana could rely on her husband's best friend, Ryuichi, who lived next door. One day, she received a notice of a class reunion from the club that Nana, Takashi, and Ryuichi belonged to in their college days. Takashi couldn't go because of work, so Nana and Ryuichi decided to attend the reunion together. However, it wasn't the memories of her old friend that dominated Nana's mind at the reunion, but her feelings for Ryuichi, which she thought she had once let go of.