I know your pain, it's been nearly 2 months since i saw a girl drop (been playing from the start). It's hard to keep up when you have no luck and others have it, but i just decide to give up the boss for some time and just exp in battle arena. I find the game quite refreshing so for know i stay on it, but if we could have a way to get girls appart from rng (pay wall is another story), it could lead to less frustration for the ones with no luck.