This is my first run for a mythic girl and it was a tough one.
i saved 207 Cf before the event. i got from them 15 drops which got me 30 shards.
after that i used only natural regeneration during the three days of the events. I was not lucky though
i got only 5 drops from 113 cf
the third day, i started to buy CF using kobans but i almost did not get her because of the time; 10 minutes before the end of the event i was stuck at 86 shards.so , i started using cf by 10 each time but i was unlicky.
5 minutes before the end, i used the option of using 50 cf and i got 12 shards. quickly after that i used 10 cf to get the last two shards .
so in this event i used 5 SP which cost me 450 kobans (i play on nutaku)
i used 742 kobans to buy cf
i used in general 740 cf to get Noemy. m drop rate was 6.75%.