The premise in that anime SF story was that a "gate" technology allowed travel at tremendously high speeds inside the Solar System (can't remember if it was over light speed or not), and this was used to massively terraform the whole system, including pretty much all the Jovian moons, Venus, you name it. Earth had been rendered difficult to live on by the destruction of much of the Moon. Mars seemed to consist of terraformed "domes" inside craters. There were huge space colonies everywhere.

While this was only supposed to be a few decades before the time of the story, the surfaces of places like Ganymede were indistinguishable from Earth, and cities had the appearance of having been there for hundreds of years.

A cool show, nevertheless. A lot of imagination.

Gene Roddenberry realized you could do the best shows by having a setup where the protaganists could travel from weird culture to weird culture every week. Star Trek did this. Later, he tried the same approach with Genesis II, with the latter being set on a future Earth full of isolated cultures, connected only by a system of supersonic subterranean shuttle tubes.