Originally Posted by Drip

So the question is: do Rainbow Medals expire, and if so, when will they expire?
I ran the gacha one time, and grabbed Jersey Cudweed, since I want to experiment with a triple hit special squad sometime. I'm tempted to play a few more gachas for another 300 medals, so I can get Waterlily Bride when she gets added as well.
Another tempting investment would be Sensitive Plant, she becomes a totally OP asset once she gets her bloomed form, with her guaranteed weakness buff for herself and 2 other party members.

Rainbow Medals do not expire.