Exodus Files: Gates of Hell.

The worlds are divided: The land of men, Earth, and the land of the monsters, Netherplains. For many years, these two worlds are separated in accord to a truce between the two faction. But nothing lasts forever. There are forces willing to break the peace just to be crowned ruler of everything. Join Nivrae, Mitsu, Doer and Orange as they face monster world's deadliest terrorist, Gates and the Mergers, and see how everything is all connected, and how the present's action disrupts both past and future.