I really enjoyed Alternative Saga: Ys vs. Sora no Kiseki on PSP. All of the menus are in English except for the item names, and the storyline is basically "fight these guys in sequence". The Wikia for the game also explains the different items, skills, and achievements pretty well. I don't speak two words of Japanese and I was able to sink 20+ hours in and have a lot of fun. If you enjoy arena fighters like Dissidia and Powerstone AND really like Ys Seven, Trails in the Sky, or both, then I'd recommend it.
Only minor problem: there are a few spoilers in the game. One Ys Seven surprise character is playable, and one Trails in the Sky character is outed as a villain.