This Art Book from Takehito Harada is truly great: Colorful, impressive and even fun to watch.
Included on each page, there is art from most popular games from NIS including Disgaea (from D1 to D4) but also including Phantom Brave, Makai Kingdom and some extras; for each artwork shown, there are thumbnails of the step by step process before reaching the full colored image, so you get to see the doodles, before actually seeing the finished picture. At the end of the artbook, you get to see some descriptions of the images you saw before.
It would have been a lot better to have that description next to each artwork rather than at the end of the book, but i understand they wanted to get people to watch the artwork without any distractions.
As for the quality, the book is well made, strong and resilient enough to avoid ripping pages by accident, colorful and feels great on the hand.
Honestly this may interest any fan of the NIS games (or any Disgaea game) but hardly anyone else will consider buying this artbook.