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Women born on the 6th June are being killed around Hong Kong. There is a lunatic on the loose. Ching, a police psychologist, looks to be the next victim. She is suffering from terrifying dreams involving the devil himself. All becomes clear when the killer is revealed as Satan's disciple, his body possessed, searching for the reincarnation of Satan's daughter on Earth.
Sai Moon-Kin is a rich man who idolizes Lawrence Ng's character in the original Sex and Zen, and works hard to please as many women as he possibly can. When marrying off his retarded son, he finds his son's new wife pretty hot, so he takes her for his own, not knowing that she is the evil Mirage Woman, who knows "sucking" magic that's pretty nasty. Tsui's daughter, who dresses like a man and wears chastity belt for the main part of the film, and the righteous Iron Man try to stop Mirage Woman before it's too late, which means that she'll have free rein to "suck" anyone she wishes.