This is a nauseatingly cute game, see all your favorite Fate characters in chibi form!
Battle involves hitting opponents with the square button, special attack that consumes mp with the triangle button, circle to jump, and x to dash. L is used to target and switch camera view, and R is for guarding. Sounds really simple, and it is. Things like jumping onto higher terrain, picking up a certain item to do super duper special attack, or dashing behind the enemy and then strike adds a little bit of strategy to the battles, but that's about it.
Now a little bit about the the unlockables in the game. There's a TON, including playable characters, pictures, characters voices, movies and background music just to name some. Everytime you complete a chapter in story mode, you earn something like currency, and then you can use them to "buy" stuff in the extras section, thus unlocking things.
Overall, I'm quite satisfied with this game, the stories are weird at times, but the chibis and extras at the end make it all worthwhile. And trust me, the characters are REALLY cute.