Firstly, this game offers too much fan service in their art. No idea how this managed to receive a rating of 12+ to begin with as the first thing u see is girls in skimpy bikinis/clothes. Anyways, you need to be a whale (big spender) as the chances to get heroes are abysmal. (SSR Characters 0.7% for limited hero events) (SSR Char 0.5% for normal summons). Campaign is fun to play and story is somewhat good. TL:DR Not F2P friendly, Bad summon rates, fun story. 4/10 😕