A ruthless pack of thugs force mild-mannered, caught-in-the-middle-of-something-bigger Nami to murder her fiance’s sister, decidedly ruining her pending marriage and landing the poor girl in the most brutal women’s prison ever seen. Inside the hellblocks, she decides to stop being a victim at all costs, and ends up becoming stronger and even more vicious than the craziest inmates in the pen. She eventually escapes in a most unusual way, gets valuable fight training from a mysterious mountain man and returns to the streets in order to make the thugs who ruined her life pay. By this time, Nami prefers to go by the name of Sasori
Naomi Tani plays Ritsuko , a popular madame of a nightclub. But, ever since her gangster husband got caught and imprisoned, her life has taken a turn for the worst. Now, in order to pay off his debts to a yakuza loan shark, Lady Ritsuko is forced to engage in private sex shows for the VIP clientele. After a year of these special shows, the loan is almost paid off.
When two prostitutes, Wah and Fong, find their dreams shattered, they resort to starring in pornographic films. A second-class actress named Tracy intentionally exposes her body, bringing her lots of acting work and a wealthy husband. She also seduces her sister’s boyfriend and gets him caught. Her despairing sister, losing all she ever had, chooses to act in pornographic movies.
When the boss of a yakuza clan in 1920s Osaka is assassinated, Oryu, his mistress, vows revenge. Her search for the killer takes her out of the city. The old boss’ son proves a poor leader, only interested in Omitsu, his high-class girlfriend. Yajima, the second-in-command, is taking advantage of the situation to accumulate power for himself. Oryu is called back to help stabilize the situation. Yajima kidnaps both Oryu and Omitsu, and subjects them to torture and various forms of sexual humiliations. During the S&M sessions, Oryu learns that Yajima was the killer of the old boss.
Bunta Sugawara is Miyoshi, a low-level assassin of the Yamamori gang who is sent to jail after a bungled hit. While in stir, family member Aoki attempts to seize power from the boss, and Miyoshi finds himself stuck between the two factions with no honorable way out.
Narumi, a man out for revenge with the powers he received and a bit of help from the one who saved his life, he creates the persona of Skull Soldier and attempts to discover who really killed his sister.