Yuta, who is traveling the world while working as a blogger, returns to Japan and heads for the alumni association just to meet a female teacher who had thoughts while attending school. While attending school, his favorite teacher married a colleague's teacher in the same school after graduating from Yuta, became Okuda-sensei, and became a married woman. Mr. and Mrs. Okuda have no children yet, and Saki loves her husband, but due to the busyness of her work, she begins to feel the passing of her husband. An alumni association at such an arrow. Married female teacher and former student. A man and a woman are alone in a closed room ...