Rising Nikkatsu talent Chusei Sone borrowed his master Seijun Suzuki's screenwriter, Atsushi Yamatoya, for this softcore pinku eiga melodrama starring British import Sally May. May plays Oman (a derivative of a slang word for "vagina"), who leaves Shanghai with her boyfriend in the early 1930s to search for her mother in Japan. Unfortunately, the unscrupulous cad sells Oman to a bordello. After some time, Oman becomes a skilled card dealer and escapes to Nagasaki, where she runs into her boyfriend again. As if she didn't have enough reason for revenge, her boyfriend has also raped her stepsister and killed her mother, so she stabs him to death and is taken to jail. Not for long, however, as this was only the first of an Oman trilogy, all scripted by Yamatoya, a cult director himself after Koya No Dacchi Waifu.
by Robert Firsching synopsis