The new event that started today was really easy. It's gonna take a bit longer for the dress blooms and skill blooms, but I already have her.
For me, I don't like the idea of grinding to 2000 materials for each event girl on beginner or intermediate, I'm going to wait until I can tackle advanced. Then I'll get all of em!
But it's definitely personal preference, the DMM client has so much crap to do it's unbelievable.
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On a side note about the event, this swan race betting thing is hilarious. I wish I could run the higher difficulties so I had more crystals to put up for bets. You can get some pretty good stuff like 50 life crystals and such after the first week of betting.