Synopsis
Hundreds of years ago, a great war between humans and monsters took place. Humans managed to win and sealed the monsters deep within the mountains. Hayato, Chihiro, and Suzuna work diligently every day to eliminate and seal evil monsters. They are actually monsters themselves, but they only wish to coexist peacefully with humans. One day, they learn that the monsters sealed away hundreds of years ago are on the verge of breaking free. To prevent this, they decide to travel to that location.
