This is one of the few manga I've read that truly touched my heart. It's admirable how Fukumoto Nobuyuki skillfully portrays the trials and tribulations of a blue-collar worker thoroughly caught up in mid-life crisis. The weight of despair, loneliness, and numerous failures throughout life - all culminating to make a man feel wretched, pitiful and adrift was so well presented that I could almost feel Kurosawa'a sadness welling up within me.
Despite the sombre theme, there is silly humour aplenty - just like a testimony to the fact that life is comprised of both tears and laughter.
The conclusion may be off-putting for some, but I found it to be very fitting - making the characters and their predicaments seem all the more realistic and relateable. It also holds an important message for people who believe that riches and romance are the only sources of satisfaction that a human being can have.
As mentioned previously, the art is rather bizarre, and generally accepted as 'ugly'. While I will not deny the fact that it can hardly be called aesthetically pleasing, I feel that it matches the mood of the story perfectly - a solemn, realistic tale such as this would likely not benefit from having 'pretty' illustrations.
In conclusion - anyone with an interest in reading a touching and down-to-earth manga would do well to try Saikyou Densetsu Kurosawa; while fans of more action-oriented, romantic plot-lines should probably steer clear.
Edit : I've just discovered that this has a sequel. Frankly, I don't recommend it at all: not because the writing is bad, but because it pretty effectively destroys the ending of the main story, which, if my rating is any indication, I found to be excellent. My humble advice: If you liked the themes, mood and conclusion of this manga, don't even visit the series page of the sequel.