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I have been getting the event girls from the bosses pretty frequently. Sometimes from the very first battle with the boss! However, if you pull the regular harem girls first, then your chances of getting the two event girls increase. Just gotta keep fighting the trolls! Although, I wish the event bosses weren't always Dark Lord and Gruntt.
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Drop
Your not the only one, i would say i have tried at least 400-500 times since my last drop. I can't get any of the common girls or the epic ones i only seem to every be able to get the rares.