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Another Cynthia in lingerie so people can look at my post.
So I'm checking the amount of gems you can get for this section in the FAQ:
>1. Play until you complete the Chapter 1 tutorial. This should reward you with a little over 1,300 gems, which is enough to roll four characters (300 gems per roll)
According to Gamepress, you only get 90 gems in total from Chapter 1 (100 extra if you beat the Hard difficulty). Am I missing something?