The "Abe family" and the "Mochida family", who live in the same apartment building, have a family relationship. One day, the daughter Momoko and Natsuki's graduation party is held at the Abe family. Surrounded by her best friend and family, it was supposed to be an unforgettable day. Nine years later, Natsuki moved to Tokyo and got married. However, Natsuki will return to her parents' house again with her husband's transfer. Her reunion with Momoko... and a tragic reunion with Koji. Her sealed nightmare is revived...
