The best story in all the gacha games, period. Nothing comes even close to GFL's storytelling. The fact that the writer of such caliber has to work for a gacha game development is humiliating.
The gameplay is unorthodox and becomes very punishing very fast. The game contains tons of content.
Dailies are very demanding, like, if you do everything in half an hour it'd be an insane luck. Skins gacha is a soul-shattering cash grab.
Apart from these minor inconveniences, this is hands down the best mobile game out there, the only one I am still playing after 5 years of knowing the gacha in general.