There was a legend at the academy about a mysterious stranger who walks around the academy at night, like the school legends that exist in every Japanese school, but this one was unusual because the mysterious stranger has with her victims, and at night you try to verify this legend for yourself (of course, not because you're a virgin).

Walking around the academy at night, you ran into her, the legend of the academy, now it's up to you what happens to you, will you be sucked dry by this nymphomaniac? or will you run away? the choice is yours

The Mystery of Tengoku