After overcoming countless tough battles against powerful enemies, the time has finally come for Baki to face his father, Yujiro Hanma, who is said to be "the strongest creature in the world." Before this fight, Baki chooses Biscuit Oliva, also known as Mr. Unchained, as a suitable training partner. Oliva is currently held in a prison called the "Black Pentagon," which houses only the most violent criminals. To fight Oliva, Baki locks himself up and enters the Black Pentagon. However, in addition to the training partner he desires, he is also met by a number of terrifying fighters waiting for him there.
