Ten years ago, Marina met her homeroom teacher at a university reunion. At that time, she had been married for three years, but her married life was not going well. Teacher Sagawa was the one who listened to Marina's confessions, someone who helped her fill the void in her heart. Their inappropriate relationship began at that time and has continued to the present. He was the one who suggested breaking up first; Marina asked but still received no answer. Today is their last day together; both decided to have dinner at the restaurant where they first dated and spend their final night at the hotel where they shared their first memories. They truly did not want to part ways, they immersed themselves in memories, enjoying their last moments together, and ending with the most passionate intimacy before checking out...