>>541818691
Updated with latest info and taking into account max affection reward.
No longer can 6-star her unless you already had her.
For 5++ you only need to buy ether for 17 days if you do the missions every day until the 23th.
By the end of the event you only need 710 pieces, the remaining 40 will come from affection rewards and the announced compensation.

>>542188394
>>542191761
You can miss up to 6 days, everybody should be fine.