Straight up bad experience with the gacha. After 4 different accounts all with the initial login rewards (5-6 10x pulls and enough currency for another 30..) I did not receive a single SSR. Besides the one or two you get from the tutorial draw, I had to get my first one through a pity summon. That's strike #1. Played for awhile and obtained enough currency and items to do another 80 pulls and still didn't get another SSR even with increased banner rates... strike #2. Upon succumbing to the weakness of looking through the paid shop; I realized you could get an SSR for the low price of 120Y. But quickly realized this game does not allow anyone outside of Japan(any other country's Google play account) to buy anything.. super flippin lame and honestly just  disappointment in the creator; strike #3 and I'm out. In conclusion this game is not for me, and I'll never try it again.

Generally very enjoyable game. If you want a lot of Servants though, you must have tons of money or tons of patience. The story is passable, the fighting is good, but the gacha aspect still irks me. I'm F2P but I'm still having fun. Don't let gambling discourage you too much.