2nd month is a little harder to get crystals. Couldn't wait till it ends, so spent 125 on different draws:
(3) Christmas - platinum Christmas Sharlotte (first draw), 2 silvers,
(12) Switched to Premium 2 - 2 platinum (Barous, Shaomei), 6 gold (Rino, Margaret, 2xStella, Rorie, Roberto), 4 silver,
(3) Switched back to Christmas - gold Christmas Alisa (second draw), 2 silvers,
(3) Switched back to Premium 2 - 1 silver, 1 gold, Teeny (guaranteed black)
(1) Switched back to Christmas - platinum Christmas Bernice (guaranteed platinum)
(3) Finished with pick up - platinum Victoria, gold Bernice, gold Clea.

I like this result - all three special Christmas units+black Teeny that I wanted. Also other units seems interesting (some new classes that I didn't have before - summoner, elementalist).
Now I just need to get 22 remaining crystals (already have 3) this month and finish draws up to 150 spent crystal.

Also checked that if both guaranteed draws expire at the same time you get black unit first and platinum remains at 1, so you draw it next. Was a little scared that one will overwrite the other.