Around Ginza there is a night-city of bars and cabarets, hostesses, customers. Assisting to keep order here is Kagari (Akira Kobayashi) who specializes in the women, their problems and troubles. He has saved many a girl from blandishments of pimps, makes customers pay up and women play straight. So he is called 'the woman's police-man' and he takes his job seriously.
One day, Chiyoko (Yukiyo Toake), a former hostess, comes to him. Her husband has been murdered and she wants help. The man had been a college classmate and Kagari decides to do what he can. In his investigation he overturns a whole nest of intrigue. Men he had thought irreproachable turn out to be corrupt; solid citizens are seen as the worst kind of scoundrels. Until now, Kagari has specialized in women and their problems. But, realizing the real state of affairs, he rolls up his sleeves for a good cleaning- up-at the same time discovering the murderer of his friend.