A young aspiring amateur scientist named Eiji creates the ultimate painkiller: a drug that turns pain into pleasure. His miraculous invention is called MySon, a tribute to his dead father. His mother, a professional scientist, has been conducting experiments on three young women. Without her approval, Eiji manages to add his MySon potion into his mother's test.
He then follows the three unsuspecting guinea pigs to see their reaction to his new creation. Things start to get out of control when the women realize that the more pain they inflict on themselves, the better it feels! Eiji is unable to contain the women's obsession with pleasure and his own obsession with one of them.
Spoken Languages: Japanese, English subtitles.