There are three series of Baki, this one is Grappler Baki, the 1st one.
1-Grappler Baki(1991-1999) 42 volumes
2-New Grappler Baki(1999-2005) 31 volumes
3-Hanma Baki: Son of Ogre(2005-12-05) ? volumes
“To be the strongest in the world!“ That is Baki Hanma’s dream. The mysterious, young, martial artist aspires to follow in his sinister father’s footsteps as the world’s strongest creature. But to what lengths will Baki go? We follow the young grappler as he matures in a world full of some of the strongest fighters and how he overcomes all obstacles in order to face his father one day in the fighting ring. From the jungles to and underground martial arts tournament, Baki is put to the test from fighters all over the world.
This brutal, yet master piece of gritty martial arts features detailed and action packed artwork by Keisuke Itagaki and continues to build a fan base seeking incredible martial arts manga.