It's a fictional book in which videogames play a large role. Mainly a dark comedy about a guy who's extremely obsessed with old arcade games (a love rekindled by MAME) and begins to shape his life more and more around that obsession. Like with you and Itagaki ;)
There's a lot of really great moments that people on TNL are likely to understand very well. Like whenever he remembers an old game - often in a sharp satire of a "philosophy in cultural studies" type format. Or on his skewed views of Japan.
This certainly isn't the best of those moments, but it's not the worst either, so it'll give you a feel of the book. Check it out, and read TNL's review too.
http://www.luckywanderboy.com/excerpt.html