Great book for the fans
Great book with really good quality paper and print. Shows a lot of good illustrations, character description and cloths, backgrounds and scenes from the game, interviews with the voice actors of each character and some other informations. All in Japanese.

Good for the character reference, but I'm not sure if it can help to play the game. Its kind of a dating game where the main character is a miko and there are a lot of bishonen single demons around the town... I bought this book for the male characters only, I didn't even knew about the game before... and I was pleased. ;)