the game is fantastic. i was so excited when i saw this, i instantly grabbed it and didn't let it go. it saddly did not live up to the game. the comedy fell just short of actually being funny, and much of the story of the 60+ hour game was changed to accomidate the one volume graphic novel. i was glad to see that the sequel was more than just one volume, but that also means i have to track down more than one volume.
back to this book. a lot of the elements were the same with the book and the game. character relationships, personalities (the last time i saw an adaptation of a video game, they had combined a couple of characters into one, drastically changing personalities and the flow of the story), and of course the prinnies were the same too. i sort of wish more of the game would have come out in the book, but i guess i can't complain too much. shindo stayed fairly true to the intent of the game, and it was fairly easy to see which points he felt were important and therefore made it into print.
but if you like strategy games and at least somewhat liked this manga, then you definately have to play the game. it's truly a requirement at that point.