I'll be quite straightforward with my review, since this manga doesn't have much apparent to analysis, any great plot device with which I may convince you to read this. All I can say is: go there, only one volume, enjoy the experience.

Kafka is a well knowng writter, but many times we forget that it has done anything apart from The Metamorphosis (No, not Henshin Emergence, the other one). The thing is that Kafka had some recurrent creative themes about bureaucracy, hunger and loneliness, with which he struggled during his life. And the Nishioka Brothers have the abitily to not only understand this themes in Kafka's work, but also give them a personal shape with their unique art style and take the immersion experience to a whole other level.

So, if you enjoy your Kafka (or your Camus, I find their style quite similar), or if you only want to get immersed in some twisted imagination with odd art and a whole lot of subtext, this is for you. If you want to enjoy your time in a Saturday evening, then Kafka is quite the wrong read; I mean, c'mon, it doesn't even have characters technically.

PS: If you can convince your friend and read the manga simultaneously, it will be good for discussing and sharing perspectives.
And another thing: reading this while listening to some Tool albums is freaking insane