The perils of playing a 'F2P' game. My advice is not to sweat it so much and just focus on making a strong team even if you have rank 3s as the backbone. Enough Ampys tossed in will make even a Rank 3 strong enough to take on Ultimate.

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According to several gacha discussion in forum. It is assume that 5* guaranteed ticket limited gacha is the best way to go. I never tried one before, but people said that you will get 11 girls + 5* girl. Which 12 girls in total.

Personally, the developer should have left that guaranteed ticket gacha feature all the time. For few reason:

1. Most players will not spin other gacha anyway. (Unless it is 5* and 6* guaranteed gacha)

2. New players will felt cheated because they didn't know that gacha was existed unless they are lucky to see one.

3. 5* character are difficult to get from gacha.