In a random World, home to a multiverse traveler.

The World here is nothing special, other than the unique abilities some individuals in it hold. For instance, one who can travel the multiverse. Ria had her interest piqued in said individual. Normally, she picked a World and dropped the Note for anyone to find... But the idea of a mortal who could travel the Multiverse was too good to pass up.

Sure, it was against the rules for Erokami to take people to other Worlds, as it often led to key people ending up leaving theirs, and causing that particular World to go down the toilet. Indeed, a lot of trouble had been caused in the last before the Erokami had that rule implemented... But mortals were not beholden to the rules of Erokami... Just of the Sex Note if they used it.

So she dropped it in their vicinity, and waited to watch the show.

(This of course is an opportunity for anyone to make an OC, or they can just use a preexisting multiverse traveler of their own. I don't intend on doing it myself, at least at the moment, but I definitely encourage you all to take the idea and run with it!)