Rio is buggered. She has got a very boring assignment to do. So she decides to hand over the assignment to Karen. The trainee Masafumi is supposed to help her. While chasing a man who is cheating on and playing S&M games with his mistress, she gets so horny that she falls all over Masafumi. Meanwhile, Rio tries to find out who is dealing with not legal substances in the city in order to perpetrate innocent women. After a while, she comes across a gang of sex-crazed perverts. These in turn happen to find out about the Venus Detective Agency, which is where Karen and Rio work. So they lure the two women into a trap.
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