yes. Just need to be very lucky.
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I want halloween juliette and arcana TT
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I can confirm this isn't true since I got Solveig from the Ninja Spy and I've only reached the secret lab in the story. My guess is that you only can get the girls once you see them in the story but that could be wrong too. That being said i've farmed Dark Lord about 150 times now and there's been literally nothing from him for me so the drop rates could just be total shit.