well, I tried for Mahiruiarty too, but... no luck.
https://twitter.com/Shinkou0/status/1163374476505100289
I stopped at 24K since I don't want to risk to empty my gems without getting a 4* stage girl, so I decided to stop, start saving again up to 30K, and then pull again in the next Mahiruiarty/Amaterasu kirafest.
Good luck to anyone who tries!