Genuinely fantastic game until adventure rank 50, then the scale for 'time spent-rewards gotten' just plummets. Advancing Ar55 to Ar56 takes 3-5 months and the reward is 1 free pull and some pocket change. Yay. Only for dedicated gacha gamers! Otherwise expect a lot of frustration. Edit: lowered to 2stars. 1.5 years into the game and there's still no content for advanced players aside from stupid abyss. My patience is definitely limited...