There are three series of Baki, this one is Hanma Baki, the 3rd one.
1-Baki the Grappler(1991-1999) 42 volumes
2-New Grappler Baki(1999-2005) 31 volumes
3-Hanma Baki: Son of Ogre (2005-12-05) 37 volumes
Concentrates on the conflict between Baki and his father.