Masaaki was born when Arisa was still young. Raising a child was hard, but her husband was supportive and they were a happy family. However, when Masaaki entered university, her husband's affair was discovered and their relationship quickly cooled. They were no longer a married couple, and divorce was just around the corner. Summer vacation had started and Masaaki was coming home for the first time in a while, so Arisa was waiting for him at the station to tell him about the divorce.