Riki, Gin, Weed, and Orion. Among the Ou Army—a group of renowned strategists who have long upheld its enduring history and a gathering of the dog world’s fiercest warriors—stands Akame, the Iga ninja dog, a figure of extraordinary ability. His origins have long been shrouded in mystery. Now, his shocking past is finally revealed!!! (Source: Nihon Bungeisha, translated)

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.

Ancestors of the shinobi dog Akame participate in the Iga war against Oda Nobunaga in 1581.

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