在20XX年，日本面臨著最后一場戰爭的危機，一個軍事公司開發的“大規模毀滅性超級武器”被恐怖組織奪走。同時，半機械人的克里斯·索奧托姆（Chris Saotome）被轉換為殺戮武器，遇到了一個名叫薩拉的神秘女孩....

　　啄木鳥（曾志偉 飾）和甘油條（陳友 飾）是同事兼好友，兩人相識多年，默契十足，感情十分要好。某日，在執行追捕黑幫大佬阿成（沈微 飾）的過程中，兩人結識了警花吉吉（古嘉露 飾），三人結成搭檔。于是，在啄木鳥和甘油條之間，一場異常激烈的撩妹比賽拉開了序幕。雖然啄木鳥能說會道十分神氣，但甘油條似乎更加喜歡內向靦腆的甘油條。　　阿成綁架了啄木鳥和甘油條的好友花利文（陳百祥 飾），想要以他的性命威脅兩人，換取自由。啄木鳥和甘油條自然為了救出好友而火速前往現場，面對殘暴的阿成，兩人能夠順利的救出花利文嗎？

A noir portrait of Italy in the Seventies.

　　The nightmare was about a demonic possession. A long time ago, there was an evil in a small town and it was jealous of the girl and would never let her go, since the devil loved the girl. One night, the evil raped the girl and she became pregnant. After months the girl could not hide her baby, her father figured her secret out and clapped the girl in irons and locked her room door. But the evil put the gun to her father' temple and saved the girl. The father had a stroke and had been sleeping on the bed for three months and died. Time went on and the girl brought a child into the world. Naturally, people who were living in the village heard the story and they did not want to see neither the girl nor the baby since when the baby was born, plants dried in the field, fishes lost in the lake and people had prayed to the god for rain, but nothing changed in the village. People got so angry, dug a hole in front of the fountain, put her into the hole and threw stones at her face. The girl died soon after. The evil went off the deep end, took a revenge of the village and killed everyone except two sisters because the evil wanted them to take care of its baby...