Nutaku version has screwed over the game really bad.
For the Mercenary event, aside from Mono, even DMM version doesn't have the other 4 girls yet.
As for the other girls, we're suppose to have them in gacha. In fact we're missing 8 platinum girls and 3 more girls who we already got aren't in platinum gacha, so we're missing 11 platinum girls. Then events... we're missing 2 event girls and 4 exclusive themed girls, giving us a total of 14 never gotten girls and 3 who just disappeared from existence.