Hinata is happily married to her childhood sweetheart, but she has a past that she cannot reveal to him. She attends a high school reunion to address this issue from her past and runs into her former teacher, Sawaki. He was known for helping his students with their problems, but for Hinata, he was the man with whom she lost her virginity and taught her about sex. Although Hinata wants to apologize to Sawaki, she can’t bring herself to do it and instead feels excited as she recalls their past together.