evidence of my horrible roll luck:
Dec 2016 22 rolls: 12 silvers 9 golds 1 plat 0 black
------Plat = Mia ; no Rino/Margaret/useful golds from the 9.
------Mia obtained in 11th roll.
Jan 2017: 30 rolls 3 plat 0 black (Cellia, Zenobia, Shizuka)
Feb 2017: 10 rolls 0 plat 0 black
Mar 2017: 10 rolls 1 plat 0 black (Sakuya, 6 silvers, 3 golds, one of which = monica)
------------14 rolls 1 plat 0 black (Leora, 5 gold, 8 silvers)
Apr 2017: 15 rolls 0 plat 1 black (Tifa-chan <3, 3 gold, 11 silvers)
------Tifa-chan obtained in 3rd roll
1st rolled black in 22+30+10+10+14+3 = 89 rolls
and that ends my data tracking.