Granblue Fantasy is adapted from a mobile game with the same title. What can you expect from that since the story from the game it self is not really interesting. Fortunately the soundtrack and art really covers the scores, in my opinion. This anime is created to make the players from the game excited, because they can see their favorite characters in the anime animated, such as Narumeia. And also bonuses like SSR weapons that they gave when Gran's crew fights the Primal Beast in the anime afterwards. To be honest. It's pretty decent. I'll give it a 7/10 since i actually played the game my self. If youdon't like the anime, go ahead and check the game if it's better.