I'm doing pretty well, near 40k bouquets. I've gotten a lot of radars from pink cases which has helped a lot.

Another thing that I've done that might just be in my mind or something is that sometimes I'll notice that even without radars I'll get a nice string of luck of strong chances/battles. If I see this I usually use peronamin (half since get a lot from cases) and keep going (ignoring mission turn ins and such, tbh turn ins aren't great for this event anyways), along with puddings if I fight a lot. I will do this a couple of times more if I feel my luck is still there (usually if on the last round of extra stage before empty stamina, if I get 2+ strong chance/battle).

It could just be in my mind, but doing that seems to help me.

Edit: Also tried to find something about whim gacha and found this on wiki
http://peropero.wiki.fc2.com/wiki/%E...83%81%E3%83%A3

Sounds like maybe a special type of gacha or something, hard to tell if uses real money or not, my guess is it does.