Eiji, a teenager eager to follow in his late father's scientific footsteps perfects one of his old experiments to diminish the barrier between pain and pleasure.
A man who felt the ideal in everything about women and took a mistress away from her partner. And so began a life of deep love between the two. But one day, when a female classmate came to stay with these two, they experienced a threesome and things changed. Furthermore, as she experienced it with many men, she felt the limitless joy of being a woman...
"Groper Train" pink film distributed by Xces / Nikkatsu.
