We know that middle age is often a dull and relatively lethargic phase of human life. And, this manga not only potrays middle age life for an average man, but it sheds light on a darker side of life in general.
The storyline of the manga is a direct sequel to the original Saikyou Densetsu Kurosawa. After the events of its prequel, the protagonist Kurosawa wakes up from a coma after eight years. His life is messed up, he's without a job. And he doesn't even have a home to rest in. So he starts a new life. A life of a homeless man at the
hefty age of 54. There, he befriends a relatively younger and smarter guy who he refers to as "Sensei".
The story so far is pretty straight forward and direct. But it allows the reader to take a step back and experience a moment of introspection. The appeal of the story is symbolic, rather than being direct. The mangaka, Nobuyaki Fukumoto refers to the protagonist as "The Strongest man on Earth", which itself possesses a dual nature being symbolic as well as an irony.
The character development so far is pretty intriguing as well. We get more insight to Kurosawa. The character of sensei got a really good introduction as well. We see a lot of depth to his homeless lifestyle and his sanity pertaining to humanity.
Fukumoto features his unique art style. The same art style can be seen in various other famous works such as Akagi or Kaiji. It's not the best art style. But it really stands out and mostly rotates in the reverse direction with humanity being the frame of reference. Hence, it often goes in perfect sync with the nature of the story.
Overall, Shin Kurosawa: Saikyou Densetsu is an excellent ongoing manga which is highly underrated and under-appreciated. It is definitely worth reading provided you enjoyed the prequel.