I love this game. The general setup is pretty much like any other gatcha RPG, but the main differences are that: 1. You can do battles in the background. This may not seem like a lot, but it really makes the gatcha rpg format way better 2. They are extremely generous with diamonds and rewards in general. It's EXTREMELY f2p friendly 3: the UI is really nice. It took a little getting used to, but it's pretty and functional, which is what it needs to be. And the character designs are amazing too.