Very Complete
This guide has extensive maps, screenshots of every single move, lists and pictures of all items, side quests, etc. There is also an extras section for skit faces, index of people and places, and blurbs about the history of the world. Recommended if you're a serious fan.

COMPLETE guide
It's not only a walktrhough, but a complete guide with listings of all items, artes, cooking, skirts, how to get all side-quests... EVERYTHING.

The only con: it's completely japanese. Some parts of the book cannot be understood just by looking at the screenshots, so you do really need to know japanese