I didn't really mention this in the OP but actually it doesn't really matter. They're from Japan and the app is Line. I have my second language set as Japanese on OkCupid and have had a few visits and messages from women in Japan before so I didn't think it was that unusual. I think they've searched for people anywhere by language maybe? Mostly they're pretty cool but exchanging messages is more or less pointless outside of getting the chance to use our second languages, so thats about it.
Yeah only a week, my need to know wtf is already at critical levels so this is never gonna be a year long saga or anything.