By spending Lesson Tickets and Coins, you can level up your Stage Girls and increase their Power Scores. You might have a favorite Stage Girl, but also make sure to level up a tank who can stand in front to defend the others! There are also Lesson Ticket Hunts in the Events screen that give a ton of Lesson Tickets!
Use Pieces and Coins to unlock Skill Panels and boost your Stage Girls' stats. Complete Revues to collect Pieces or purchase them in the Shop! Unlock eight Skill Panels to rank up your Stage Girls, and shoot to get them to Rank 9!
If you don't have enough Pieces and can't unlock Skill Panels, don't worry! You can select Stages to get Pieces from the Skill Panel. By using the Skip function, you can collect Pieces quickly.
Collecting Potential Crystals will really let a Stage Girl's talents bloom! This will raise her rarity level, unlock her level cap, and allow her stats to go even higher. You can obtain Potential Crystals via Potential Crystal Hunts, Events, and in the Shop.
Raise a Stage Girl's Bond Level by giving her Gifts. You can obtain various rewards or stat increases when the Bond Level goes up. Different Stage Girls like different things, so figure out what Gifts to give to maximize the Bond Level!