Other Planet

The anime will fit this category if some or all of the action takes place on another planet which is supposedly in the same universe as Earth, not a complete fantasy world; usually there has to be some concept of space travel. The Latin name for Earth - Terra, would also pass the condition of being in the same universe as Earth. Basically, even mentioning of Earth existing or having existed would be enough. Although Moon is a moon, it also qualifies as Other Planet.