Based on the erotic game by Tinker Bell.

Hundreds of years ago, a huge war between humans and monsters happened. Humans somehow won world war 2 and sealed in the monsters deep in high altitude climates.... Hayato, Chihiro and Suzuna give your very best to eliminate and seal up evil monsters every single day. These are actually monsters, however they only want to coexist with humans. Eventually, they hear the monsters sealed up ages ago have to do with to come out... To halt it, they opt to check out the place...