Hanma Baki or Baki Son Of Ogre is the 3rd Part of the Baki series, please watch Baki The Grappler Anime & read New Grappler Baki.
Baki Son Of Ogre delivers in gritty action but starts to shift its tone. The story begins with Baki developing a new form of image training where he can physically create an opponent to spar against (originally featured in Baki VS Retsu Kaioh). This new form of training eventually becomes Baki's newest fighting style as incorporates animals & insects into his attacks.
The first arc takes place in prison where Baki intentionally commits a crime just so he can battle
against Olivia Biscuit. I personally found the first arc very slow as the focus was more on Olivia than Baki himself.
The 2nd arc & possibly the best written arc in the Baki series is "The Pickle Arc" where a caveman from the Jurassic Period is revived in modern society. Several Baki characters battle against Pickle as centuries ago Pickle managed to not only fight dinosaurs but eat them occasionally. Several characters gain development & life changing events as they battle Pickle.
The 3rd arc is sadly untranslated as it seem to deal with Retsu Kaioh being a boxer. Not many of these chapters can be found online.
The last arc of Son of Ogre is the long awaited fight of Baki Vs Yujiro. Depending on your viewpoint, this battle is either anti-climatic or okay.
Overall, this chapter of the Baki series certainly delivered its action & easily its most savage fights in the Pickle Arc. Due to certain events in these arcs, convinced me that Toriko has gained some inspiration from Baki Son Of Ogre due to the Pickle character. Lastly, the next part of the Baki series is called Baki Dou or Way Of Baki which deals with a clone of Miyamoto Musashi. Only time will tell how Part 4 will fare.