Tired of poverty, Keiko leaves home and soon takes a lover, but leads a wanton life without paying heed to his advice. However, the younger sister Yoshiko, is an innocent and kind girl. One day, with the sudden death of their mother in a car accident, Keiko learns that she and Yoshiko are actually stepsisters, and that she is the daughter of a murderer. She now plans extortion from Yoshiko's true father who is the president of a well-known trading company.
| Directing | Michiyoshi Doi | Director |
| Writing | Akira Sugimoto | Screenplay |
| Production | Tatsuyoshi Shimamura | Producer |
| Production | Mitsugi Okura | Executive Producer |
| Sound | Teizō Matsumura | Original Music Composer |
| Camera | Mamoru Morita | Director of Photography |
| Art | Masatoshi Katō | Art Direction |
| Sound | Haruo Numata | Sound Recordist |