Ten years ago, Marina met her homeroom teacher again at a university student class reunion. At that time, having been married for three years, Marina's married life was not going smoothly. Mr. Sagawa was the one who listened to Marina's feelings, the one who helped her fill the void in her heart. The wrong relationship between the two started then and continues to the present. The teacher was the one who suggested breaking up first. Marina asked but still did not get an answer. Today was their last day together, the two decided to have dinner together at the restaurant for their first date, and spend their last night in the hotel where they had their first memories. The two really didn't want to be apart, they immersed themselves in memories, enjoyed their last moments together, and ended with the most intense lovemaking before checking out...