Tsubasa, Atsushi, and Yoshito have been childhood friends for over ten years. Tsubasa and Atsushi, who secretly harbored feelings for each other since childhood, decided to end their relationship upon learning of their best friend Yoshito's affections, choosing instead to marry him. To sever his feelings for Tsubasa, Atsushi married another woman, but the marriage didn't last and they eventually divorced. One day, a powerful typhoon strikes the Kanto region, and the doorbell rings at Atsushi's house. Standing there is Tsubasa, drenched and crying—her arrival marks the beginning of a new story.