at the beginning the game Looks promising. But  after inspecting every part of the game.i realized it is nearly impossible to collect stones for Gacha. This means that you must invest in the late Game to make realistic progress. The quest from after the selected Gacha needs an investment of 100 bucks too.

I've quit after 3 days playing, and didnt pull gacha even once as F2P outside the initial tgacha tutorial. For gacha game, this games is so cheap in terms of rewards.  To make it worse, even among the rarest monster, the drop rates is not even equal. Its a shame since the graphic and story are good actually, but those 2 are the only good things about this game. The core  game itself is MEH.

Great gacha game, you don't really have to pay for anything but the option is still there, the real grind is leveling up your heros rather than actually getting them so it feels refreshing to play if your used to the usual gacha system.