A salaryman finds himself in the same train car as an adult college student who won a beauty pageant. Her flawless face and voluptuous body drive him to grope her even at the risk of arrest. Days later, the last thing he expects is for her to admit, "It felt good. Could you touch me more?" From then on, he repeatedly gropes her on the train before taking her to a hotel for molestation-style sex, and she becomes thoroughly addicted to the thrill and his technique.