SSIS-366 ...The teacher's married wife met her former student again at the class reunion and had a passionate relationship with her, Saki Okuda.

Yuta, who travels the world as a blogger, returns home and heads to a class reunion just to meet a female teacher he had feelings for while attending school. When Yuta was in school, the teacher he liked married a fellow teacher at the same school after Yuta graduated, became Mr. Okuda, and became a married woman. The Okudas do not have children yet, and although Saki loves her husband, she begins to feel a misunderstanding between them due to her busy work schedule.