Married for 20 years, Yuri's daughter is now an adult and she lives an ordinary but happy life. She has a good relationship with her husband and isn't particularly dissatisfied. One day, 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 their relationship was forbidden, but he was a pure and modest young man. Seeing his honesty reminded Yuri of her youth. "I'm seriously in love with you, Yuri-san..." "What are you talking about already?" "I know what I'm saying is strange. Yuri-san has a husband and Mao-chan, so... I know that it's an unrequited love..." "...Amano-kun..." "Finally...can I hold your hand?" "Huh?... What should I do..." "With this... I'll give up..." Yuri instinctively holds his hand. At that moment, the Kokoro that had been sleeping inside Yuri awakens. A love that she had forgotten for years... Those feelings destroy her reason and develop into a forbidden relationship.