Yuta, who travels the world while working as a blogger, returns to Japan and heads to a class reunion just to meet a female teacher whom he had a crush on while he was in school. After Yuta graduated, the teacher he had a crush on married a fellow teacher at the same school, and became Ms. Okuda, a married woman. The Okudas do not have any children yet, and although Saki loves her husband, she begins to feel a disconnect between them due to her busy schedule at work. Just then, a class reunion comes up. A married female teacher and a former student. A man and a woman are alone in a closed room...