Born in the bitter cold of the Ouu Mountains as the son of Riki, the mightiest bear-hunting dog, is the magnificent tiger-striped puppy, Gin! 
To defeat the murderous Akakabuto—who seeks to build a stronghold deep in the mountains of Ou after defeating his grandfather and father—Gin joins the Ouu Army, his youthful blood boiling with determination!! With only three months left until the final showdown with Akakabuto, his eyes are set on finding true “men” who will fight alongside his comrades to the bitter end against Akakabuto, as he races across the entire land of Japan!! (Source: Toei Animation, translated)

A dog named Weed happens to hear that he is the son of Gin, The great leader of Ohu, Who lead the dogs of Ohu to victory in a fight against monsterous bear Akakabuto. Weed wants to find his father no matter of what. On a way to his father Weed meets many friends and enemies.
 
(Source: Anime News Network)

A giant demon bear named Akakabuto has taken over Futago pass. Shortly after, a silver, tiger-striped Akita pup named Gin is born and is trained as a bear-dog. Gin is brought to Riki (the leader of a large pack of dogs and Gin's father) to join the pack. Riki let's him join after proving his strenght and sends his platoons to all parts of Japan to recruit strong males to fight Akakabuto. Gin, the third generation of bear-dogs goes through many hardships for the purpose of stopping the terrifying bear, Akakabuto. 
(Source: Anime News Network) 
Note: Chapter count reflects the original serialization in Weekly Shounen Jump. The chapters were later combined into 55 chapters for the tankōbon release.

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