Revolutionary for mobile gaming. Out of all mobile games I've ever played this is by far the most incredible and it has a very high budget, so you get breathtaking animations and top voice acting (at least in jp dub). The gacha is very expensive if you buy into it, but it is far more optional than the majority of any of the other gacha games out there because there is no PvP at all -- entirely PvE, and mostly solo with some coop elements. I would recommend this game to anyone, hands down.