Natsuko had been married for 25 years. Her daughter was an adult and she lived an ordinary but happy life. She got along well with her husband and had no particular complaints. At that time, Natsuko meets Kanno, a senior student of her daughter's. At first, they have a casual relationship. However, Kanno fell in love with Natsuko at first sight. Sugano was a pure and modest young man who knew that it was a forbidden relationship. Seeing his honest attitude reminds Natsuko of her youth. "I'm seriously in love with you, Natsuko..." "What are you talking about already?" "I know that sounds strange. Natsuko-san has a husband and Yuna-chan... I know it's an unrequited love..." "...Kanno-kun..." "Finally...can I hold your hand?" "Huh?...What should I do..." "I'll give up on this now..." Natsuko instinctively grabs his hand, and at that moment, the excitement that had been sleeping inside her is awakened. A love that had been forgotten for years... Those feelings overwhelmed his reason and developed into a forbidden relationship.