I'll take your word for it considering I know almost nothing about Japon or Japan.

[ She gets up from the table, taking both of their plates over to the sink in order to wash and clean up. Velvet had been cleaning when she was done with using kitchenware while cooking so there's not a lot left. ]

You could ask around to see who else might be from this Japan or might have heard about it.

[ So far the three of them are from the same world but who knows how many other worlds are represented here. ]