Jigoku is one of the moons orbiting Terra'su, like its contemporary satellite, it is also a populated world, being home to a large number of humans, Moon Rabbit Refugees, Kitsune and Succubi. Unlike Tsuki, Jigoku had also been conquered by the Jupiter Empire, groups from both this moon and Terra'su working together to try to overthrow the Empire, they eventually pushed the Empire primarily off of the moon with help from their friends from Terra'su.

Due to magic portals between this moon and Terra'su, the two are sometimes not even regarded as separate cultures, and in fact, usually have a shared government.