First off, on the smaller PS Vita screen, the graphics aren’t so noticeably bad as they were on the PS3. They aren’t very detailed, but that’s ok. You can still tell who is who and they look more or less like the anime characters that you are used to seeing. The city and the dungeon areas are simple, but it fits with the anime. The colors in the city are vibrant and happy and the dungeons look like the areas that they are supposed to represent. Your enemies are basic, lacking detail, but enemies are generic in a lot of games.
All of the voicework is in Japanese with on-screen text. Most of the time this isn’t a problem as I am used to reading the subtitles on the anime anyway. When you’re fighting, it can be a problem as you’re trying to read and fight at the same time, but they don’t talk much in this game while you’re fighting, so it’s not a big issue. The background music tends to fit well with the gameplay. It changes somewhat based on where you are and what’s happening, which keeps things from being monotonous.