Married for 20 years. Yuri's daughter is now an adult and she lives a simple but happy life. She has a good relationship with her husband and doesn't feel any particular dissatisfaction. At that time, Yuri meets Amano, a university student who attends the same university as her daughter. At first, their relationship was nothing special. However, Amano fell in love with Yuri at first sight. Amano knew that it was a forbidden relationship, but he was a pure and modest young man. Seeing his honesty, Yuri remembers her youth. "I'm really in love with you, Yuri..." "What are you saying?" "I know I'm saying strange things. You have a husband and Mao-chan... I know that this love will never come true..." "...Amano..." "Can I hold your hand... one last time?" "Eh?... What should I do..." "I'll give up now..." Yuri instinctively holds his hand. At that moment, the heart of excitement that had been sleeping inside Yuri is awakened. A love that she had forgotten for many years... These feelings destroy their reason and develop into a forbidden relationship.