In the dimly lit train car, Rika, a stunning beauty, finds herself in a game of cat and mouse with an unseen assailant. She's playing a dangerous game, one where her body is the prize. The train sways, and so does her resolve as she feels a stranger's hands exploring her curves, her bare thighs, her breasts. The game of gekidan-kinmiri, or 'gyaku-chikan,' has begun, and Rika, a willing participant, lets the stranger's hands roam, her body responding with each touch. The train's rhythm echoes the pace of their game, a tense, erotic dance that leaves Rika breathless and wanting more.