Please don't make the ring a "proposal" ring, just let it be a gift. And even if it means that she proposed, let her off since she is not even aware of any of their customs..
Im guessing that there would be a misunderstanding about Mitsuha giving her a ring... Its going to be something like "marriage" or "proposing"... you know the gist of it...
@Kampfarsch Glad you did. There was a shitton of mistakes and the quality was low due to some miscommunication.
Obviously, we just fixed the quality right now, but the text translation itself is a bit off due to a lack of translators and proofreaders with all blame to Exam season.
For how they will interpret that friendship ring MC, its dangerous you know.
They will become a family heirloom, and you just buy it cheaply for 50 yen...