Late last century, during a time period of rampant social corruption, a criminal market in human sex slavery has grown to be increasingly common. The Japanese government developed a specially trained task force to combat these crimes.

The main hero of this hentai is a young guy who is very actively looking for a girl who has a special mark on the neck, but it appears only during her orgasm, so to find such a girl. So throughout the animation guy for days and nights on the passage deals a very important thing, it weeds out the contenders for a place of his girls by experience, so he has to work up a sweat...