Hugely disappointed with this so far. The story itself isn't that bad but the writing leaves a lot to be desired. Characters keep mentioning the obvious and doing the same reactions again and again, comedy moments are not even funny. Only reading this because I am on a "Read every Naoki Urasawa manga" mission. Judging by the reviews, it doesn't seem that I will change my mind about this. I can still see why some people love it, though.
Maybe I just had very high expectations after watching Monster, and after reading Pluto, 20th century boys and Billybat.