Set during the declining years of the Tokugawa shogunate, Shadow Hunters details the questionably noble exploits of three ronin who act as "Shadow Hunters". These three ronin are not your normal ornery ruffians who are looking for a drink, a broad and someone to jab a sword into, but are in fact former samurai who, rather than follow their destroyed fiefs and murdered masters into death via seppuku, have dedicated their combined sword prowess to stopping the government from raping its daimyos for valuable resources.
Kazuko Shirakawa plays a girl who left home to satisfy her inner lust. Her passion turns to despair when she looks at her miserable life and sees the loss of her one true love and eventually becomes a prostitute. Everything is masterminded by her jealous sister, who hopes to bed her husband. She eventually gets her wish.
Yuko is an innocent high school girl who has a crush on her gym teacher. She and her friends have a sleep-over party which develops into a sexual dare-game involving eels, and a lesbian orgy. Now sexually-awakened, Yuko decides to seduce her teacher, but is raped in an elevator before she meets her teacher.
Mishima has just committed suicide. Two couples meet by accident at an inn in the countryside, the man and the woman, now, each with a new partner, who knew each other already for ten years...