Sex Machine tells of the affable but simple Hiroshi, who during one sweltering summer in a small, parochial town, moves in with his girlfriend, Haruka. Their lovemaking is as athletic as it is bizarre but a dark storm comes looming when Haruka's ex boyfriend comes knocking at the door.
A girl named Ai gets a major record deal to sing a song written by a friend of hers who is deceased. However an obsessed stalker fan slowly starts becoming more like her and tearing her world apart.
A wealthy real estate investor is forced to watch the rape of his girlfriend and then is sent a film showing the fact. He hires a hitman, Sho, and shows him the film, so that the detective can get rid of the criminals. But the boss of the criminal band is Ko, Sho's archnemesis, who raped and murdered his girlfriend.
