It's a story about Kurosawa, a construction worker in his 40s, single, no family, that through a series of events, ends up getting in fights with highschool punks. I'm not a big fan of the Mangaka's art-style (he's the same guy who did Kaiji and Akagi, among others), but the story is quite interesting and easy to read. The first volume is kinda slow and borring, but it picks up after it. Also, it's only 11 volumes short. Definetly worth a read.