Akakabuto is a vicious man-eating bear that is extremely hard to bring down. He's encountered Takeda Gohei multiple times and scars Gohei's face. The evil bear was shot in the face so he is missing his right eye. The wound to the face damaged his nervous system so he never goes into hibernation and his body grows to an abnormally huge size. He has killed Shiro, Riki's father and thrown Riki down a huge cliff. Akakabuto has aslo killed Hidetoshi's father. The village where Daisuke lives loses tourism do to the evil bear and numerous, bloody attacks. Though he is evil, he is smart so Akakabuto gathers other bears to join him and set up a defense at Gajou where his fortress is . There are also offspring of Akakabuto that appear.
Akakabuto is sends his ally bears to attack the dogs of Ou first then he fights off the pack himself. He kills many dogs and is hard to bring down. Akatora attacked him in the battle, which blinded the bear making it easier to bring him down. He kills Akatora and still is able to sense the dogs around him with his nose. Riki and Gin disable him by attacking certain points of the body so Akakabuto can't use his claws. Just when they think the bear is dead he grabs Riki and kills him. Gin uses the Zetsu Tenrou Battouga and decapitates Akakabuto, ultimately killing him.