this is a great RPG game, don't sleep on this!
this can rival almost all the Square enix titles and i'm saying that as someone who plays a LOT of them, FF, dragon quest, all that, this is up there with those heavy hitters.
specifically if you like games like SMT/Persona this plays a lot like that, you use cards to summon different "heroes" and you can fuse and make different ones, there's a lot to mess with here.
you can change random encounters off and on, and even change the enemy levels, very good for a portable game or if you're just wanna hurry, or wanna grind harder enemies to level up faster.
there's also an Arena mode, seperate from the story, which can be swapped to any time (this is actually OP since you can fully heal in arena, and go BACK to story) considering it changes battles every month (on android you can just change the date, i imagine it works the same on Vita) it's a nice distraction, or just level grind on repeat.
on android this is one of the best Mobile games i've played
that being said it's pretty long, i had near 50 hours, lost my save (on android, no cloud save and even a manual save transfer didn't work) and didn't actually complete it, maybe i'll grab this Vita version for a backup LOL.