Chihiro, a married woman disillusioned by her husband’s infidelity, suddenly receives a mysterious letter and a large box. By means of that letter from an unknown man, Chihiro avoids a misfortune, but she grows suspicious. In fact, the sender of the letter was hiding inside the large box, peeping at the sex lives of women. And the true identity of the man is… Set in Tokyo shortly after the war, it depicts a world of abnormal lust between men and women.