Good game,Really good story(slow at first),banger ost,generous gacha(you can get every new S rank if you complete weeklies and dailies),After you complete story it's supposed to be played as a side game so don't come expecting to play it as your main game(although it  might be your main game for a few weeks or a month or two depending on how fast you clear story and some other modes). Overall probably the best mobile gacha I've played