Is "In The Miso Soup", by Ryu Marikami, Post-Modern? What about him is post modern?

I know this topic has been beaten to death, but I'm curious about what makes Ryu post-modern as opposed to realism. My assumption of pomo lit is that its meta and blurs the line of certain aspects of the text.

I know that is an overgeneralization, but I haven't noticed much of that line being blurred in books such "Audition', or any of his other. Do his books just contain elements of pomo while being a part of the time period?