Baki Hanma fights a gang of 100 thugs; afterward, he is walked home by Detective Kido and his partner, who watched the fight. Baki then trains and thinks about what he should do to get stronger. Meanwhile, Kuriyagawa, the man who hired the thugs to fight Baki in order to test his strength, pays the gang's leader. Also, Baki watches a sparring match between Yuri Chakovsky, the international welterweight boxing champion, and Dinoy, Thailand's Muay Thai champion.
Baki spars with Yuri. Meanwhile, Kuriyagawa meets with Kaoru Hanayama, a gangster and renowned brawler, to set up a fight with Baki.
Baki meets his friend Reiichi Ando in the woods and stays with him. While there, Baki adopts some of Ando's training techniques, and he camps alone on Yasha Rock, hoping to fight with the Yasha Ape.
Baki Hanma fights a rematch with the Yasha Ape. After very hard fight, Baki eventually defeat the giant monster. Later he and Yasha Ape becomes a friends and Yasha Ape gives Baki his fang.