University student Ibuki meets Yuna. They fall in love but drift apart. Yuna asks Ibuki to build her a house. Years later, Yuna suddenly reappears in front of Ibuki, rekindling their feelings.

Ibuki, an 18 year old aspiring architect, attends art university where he meets the beautiful and charming Yuna. While learning about Japanese fine architecture, they fall in love with each other. Before they break each other's hearts, Ibuki had promised Yuna to build her a home one day.19 years later, Yuna suddenly reappears in front of Ibuki. She is going through a divorce and is taking care of her ill father-in-law. She asks Ibuki to build her a house in Nishiizu because it is known for its beautiful sunsets and view over Mount Fuji and the Southern Alps.During the process, they slowly rekindle their feelings for each other.