A middle-aged man watches a miniskirt schoolgirl doze off on the train and her panties. The schoolgirl notices his gaze and starts flirting with the middle-aged man. He can't resist, so he sticks his hand into his trousers and starts stroking his penis. Seeing this, the mischievous schoolgirl is Kokoro, so she pulls the man into her seat and shows him all the way up close. The three excited men get off the train...