"We met in this town 10 years ago, and have met at this hotel every year since. I don't regret meeting you, teacher. It's a precious memory to me..." A record of the time spent with Shiori, a student of his, from age 18 to 28. The two change over the long period of time from teacher and student to teacher. A sad and erotic story that combines eroticism and drama. What choice will Shiori make in the end...?