first of all it is a gacha tennis game with a super expensive price if you want to maximize your characters, there are N, R, SR and SSR (red) ,awakening is absolutely requires a f2p to play for a very long time, not a f2p friendly, costumes are only obtainable via cash, and many other absurd packages for p2w, graphic is great but sadly capped to 30 fps, no storyline, but if you are into tennis, the game is worth to try.
