The city's central loopline is packed with commuters. There circulates around an unconfirmed but plausible rumor about what happens at this loopline: it is said that in the dead of night, a special wagon called the "Molestation Train" is being operated here which is used as a place for molestation. Our protagonist, Oomichi Youji, is one of these molestation addicts who showed up at this particular loopline. Abusing his connections to the "Former Railroad Investigation Team" he's never been caught and can continue acting out on his criminal activities. But his objective isn't molestation alone. "Kukuku. Let's see. I wonder who will become my prey this time?" Inside the whole train, another spectacle is unfolded that goes beyond simple molestation: sexual subjugation leading to the downfall of haughty and proud young women. And now, the central loopline will turn into a stage where sexual desire reigns.