I have to say, you shouldnt quit the game because "Its difficult to have flower gems". Im f2p myself and i find this game really playable even with the difficulties of obtaining flower gems. I havent played this game too long time yet and yestarday i happened to gather 50 Gems. Once gettin to 50 u can already fill ur whole unit with high rare girls. And i have to remind that whole game is full of special events, and as by doing them u can exchange items for tier 5 girls by easy just an quick guide how to gain full tier 5 unit for f2p <3

(ps. im not havin full t5 due played just a month or a bit longer. But working hard for it)