One thing to note is that the girls you fight the bosses for in events are not meant to be guaranteed. By that I mean, whenever games have events there is usually a guaranteed reward. That's the first girl.

I understand it sucks not getting them, but people are reacting like they deserve to get them, which is false. The only guaranteed reward is the one girl.

You have a ton more chances to get girls in this game than in other games. For me it's almost too much. I'm getting girls so fast I can't level them fast enough. I'm getting super frustrated at the grind for cash. It wouldn't bother me if I failed to get a girl during an event.