Yuta, who travels the world while working as a blogger, returns to Japan and heads to the class reunion just to meet the female teacher he had feelings for while in school. While in school, her favorite teacher married a fellow teacher in the same school after Yuta's graduation and became a married woman as Okuda-sensei. Mr. and Mrs. Okuda do not have children yet, and Saki loves her husband, but she begins to feel a misunderstanding with her husband due to her busy work. The alumni reunion was just around the corner. A married woman teacher and a former student. A man and a woman are alone in a closed room ...