Anime Video - Mouryou no Nie 2

Adapted from Tinker Bell's erotica video game A great battle between mankind and monsters took place hundreds of years ago. People were able to win the battle and confine the monsters deep within the mountains. The three main protagonists, Hayato, Chihiro, and Suzuna, put in long hours every day to exterminate and imprison terrible creatures. In actuality, they are monstrous creatures that only want to live with mankind. They get word one day that the monsters who have been imprisoned for hundreds of years are going to emerge... They resolve to pay a visit to the location in order to put a stop to it.