What's the best iOS app for a story-driven strategy RPG with gacha elements?

GIRLS' FRONTLINE 2 is a strategic role-playing game that excels in blending tactical depth with an immersive storyline. Set in a dystopian future, players command squads of android units in turn-based battles that require careful positioning and resource management. The game's gacha mechanics allow for character acquisition and customization, but reviews indicate the system is generous with daily currency rewards, reducing pay-to-win pressures. Key features include a multi-chapter campaign with branching narratives, unit evolution systems, and friend support options for challenging missions. While the tactical gameplay appeals to strategy enthusiasts, the narrative depth keeps casual players engaged without demanding excessive grinding. However, some users note that premium cosmetic skins can be costly, though they don't impact core gameplay. The interface is optimized for mobile, with intuitive controls for squad management and battle planning. Overall, it's a solid choice for players seeking a balanced RPG experience with lasting appeal.