The Idolm@Ster Master Book

interesting if you are a big fan of the series. It has a lot of Japanese in it, but at the same time it has a lot of pictures. It also has summaries of all of the dialogues with individual characters (note; not the best answers you can give in the game).

In addition, there's a section for iM@S merchandise; shirts, dolls, figurines, CDs, birthday gifts, etc. Last but not least, there is sheet music for the 16 songs in the game.

The entire book is in color with glossy paper, with the exeption for the CDs' tracklistings and the sheet music (which are black and white, on normal paper).

While most of the guide-part of it is essentially useless if you can't read Japanese/don't have the game, it makes a nice artbook. (There are sketches underneath the front cover!)