Bullet♥︎
Does Sora's unlock ability keep weapons unlocked, and how much does it cost?
Yes. Each use adds a new unique ability or weapon, so several can be active, and they stay for the rest of the game rather than resetting each round. Sora clears one bullet within her unlocked regions for 2 AP; choosing a Star returns 1 AP, so the net cost is 1 AP, but you must be able to pay the full 2 first.