In other special events I've had reasonable luck, sometimes cutting it close, but this one feels just like the odds were tweaked lower. Hundreds of battles, 0 new girls (event or otherwise), over the last 6 days. I get that the odds are low but lately it's feeling more and more just useless. Especially if I spend some kobans for recharging my combat bar (did that a couple times) but that didn't help a bit either. Since there's no story progression and no way to spend my energy either, everything just feels stagnant.