The Dragon Quest one really works, since the bunny girl thing is an actual part of the game and it really does seem like something that'd cause a bit of a scandal in our society if someone in the position of a hero was visiting establishments like that for puff puff.
Incidentally, you should make sure you get your puff puff from official sources. The alternative is alarming.
Yeah, the space will play a part, but not in direct connection to Tsukasa. At least not her main secret, far as I'm aware. It only barely got hinted at with the very last bit of the anime, the four-part 'High School teacher' arc. Even the anime didn't really go into it, so I don't even know the full details, but... I'm sure I'll find out reading this.