I've played Ys Seven, and would seriously recommend it to anyone owning a PSP. I also played... I think it was Ys 2 or something, and didn't get all that far before I got bored. It was completely different.

Ys Seven, though, has gameplay that fits the PSP perfectly. It's fast and engaging, yet very simple. And then there is the boss battles.

Story is "okay" at best, the characters don't really stand out too much either, but are perfectly fine. Music is also decent/average overall.

The boss battles though? No other PSP game even comes close. No other handheld game that I've ever played has anything even close to boss battles in Ys Seven. There are two boss battles that I remember being pretty "meh" and the "optional bosses" aren't too impressive either, but pretty much all the rest of them are just perfect. They've pushed the limits of what can even be accomplished with the simple battle system that the game uses with some of them. A number of the mid-game bosses are comparable to (or better than) final bosses in other action RPGs when it comes to the complexity and variety in their move patterns and attacks and the sheer amount of fun in fighting them. Yes... I really, really, really love the boss battles in Ys Seven.

I also played the game at Hard, which probably made the boss battles even more epic though, because pretty much all of them were either comparable to Dark Souls bosses or worse, which made lots of the bosses insanely intense.

If Memories of Celceta is anything like Ys Seven, I'll probably get it as soon as I get a Vita.