First event I got all of the new introduced girls. Pretty rare of it to happen.
Drop rates have been generous going into the event on Hard. It was a good thing I tried E4 on Hard first, because Asakaze dropped during the TP run's boss node outa nowhere. Similarly for Yamakaze in E2.
Can't say I really finished E4 on Hard, though. That HP gauge run was just... //puking blood just thinking about it.