Yuuta travels the world as a blogger, but returns to Japan solely to see the female teacher he once had feelings for during his school days, attending a class reunion. The teacher he fell in love with while studying later married a fellow teacher at the same school after graduation, becoming Mrs. Okuda, a married woman. The Okudas don't have children yet, and while Saki Okuda deeply cares for her husband, she's begun feeling emotional distance due to their busy work lives. When she reunites with Yuuta, her former student, the two find themselves alone together in a confined space. As past emotions collide with present desires, a new possibility begins to bloom.