A naughty project where we get on a women-only train car during school hours and see what the high school girls think. The high school girls are curious about the man who got on by mistake (or pretended to be), and when they tease him without being noticed by the people around them, he can't help but get an erection. The high school girls' mischievous Kokoro turn to excitement as they see the man's erect penis, and they reach for the erect penis that the man is pointing at them...