Heaven in Angel World is where Goddess Ilias won her battle against Dark Goddess Alice and a world in Monster Girl Quest Paradox
Overview
This place wasn't fully explored but when Luka entered Esta from his world, he perceived this parallel world thanks to Raphaela, one of the Seven Archangels and the Esta residents and perhaps the Rubiana people have been transported into this world. Esta has a Tartarus similar to the one in the surface in the Paradox world except that it's in the sky.