Honestly highlight me and tell me how Grand Kingdom is, when you play it, I want to gather as much opinion on the title as I can before making a decision.
Like prince said, I thnk there is a demo you can check out. I tried the japanese demo back when it released in japan and I enjoyed it. I liked that you can cast a spell or attack and damage your own allies, thought it added a layer of strategy(how to poistion). The game also looked pretty. All in all, I'm just waiting on reviews to see if it has a meaningful story because I can't play games unless i enjoy their plot (even if they are simple, i just need to like them ^^)
Fate/Extella E3 2016 trailer
I hope all these effects don't rek the vita.