Apparently there is a theory that there are alternate universes where things are opposite or weird compared to our current universe that are accessible, but impossible with our current means of technology. (In other words, we're women, or we're all zombies, etc.) He's saying that he wants the power to travel between them.
And then he compared it to an anime, which I don't really remember seeing an episodes about being the opposite gender, so he must be talking about the manga.
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