It’s 1940, and the population of Japan is divided over its entry into World War II. Satoko, the wife of a fabric merchant, is devoted to her husband but is beginning to suspect he’s up to something. Soon she allows herself to be drawn into a game in which she enigmatically conceals her intentions.

Maki Maki, Sebuki Suzume, Beppu Tsukasa and Iemori Yutaka happen to meet and form a quartet. They even begin to live together in Karuizawa during the winter, but there is a big hidden secret.