Mako Oda's peaceful daily life begins to change when her son Tsubasa moves out to live alone. Jun, Tsubasa's childhood best friend, had frequently stayed over at their house and grown close to Mako over the years. Kind and elegantly beautiful, Mako had always represented the ideal mother figure for Jun. But as adolescence hit, his admiration gradually transformed into romantic desire. For Jun, visiting Tsubasa's home was never about the friend—it was always about spending time with Mako. With Tsubasa now living independently, Jun finds himself losing that precious time with her, altering their relationship. Mako's husband is away on an overseas assignment, and without her son at home, she begins to feel a deep loneliness. Jun senses her solitude, forcing him to confront his own emotions. Between the two, new and complicated feelings quietly begin to grow.