She divorced her husband 10 years ago and raised Tatsuya single-handedly.Tatsuya also got a job and decided to live alone in April.One day, Tatsuya wants to go to a hot spring for his graduation trip.I was invited to a hot spring trip for just the two of us. "Thank you mother. I've always loved you..." Her son's sudden confession shakes Emiko's heart.She couldn't stand living separately after this trip.A sweet air flows and her real parent and child open the forbidden door...