@Z0mbieJr string theory, basically... Jouske's bubbles are spinning lines, which probably vibrate in different ways that our universe does, basically existing in their own mini-realities. That's what i speculate, more or less.
Also Kei's fucking dead, y'all, that's what i got from her stand disapearing, at least. she was the hero for a brief moment, it was way more dignified than Hot Pants, at least. But now that Kei and Mamezuku are gonners i have a bit more faith Yasuho is gonna make it (at least until they defeat Tooru).