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The story of takes place in Japan during the late 1550's – early 1560's. It tells the tale of the legendary ganins – a special type of dog ninjas. The ganins have a special pin inserted inside their helmet which develop their brains to a human level, where they can learn psychic powers, physical supernatural strength, telekinesis and even human language.
The story begins when Gamu defeats a warlord and returns to the current lord his clan works for, lord Eda. However, the Eda village is soon in trouble as the evil clan Gama attacks and kills the leader of Kagero and Rando's father, Ryuugen. Gamu subordinates Kusakage and Shiba disappears in the battle as well.
Gamu and Rando keeps a low profile and live in solitude until they meet Kinoshita Toukichirou who introduces them to Oda Nobunaga. They team up with the Nobunaga clan to fight Gama's allied army lead by Imagawa Yoshimoto. After defeating him, Gamu fins his old subordinates Kusakage and Shiba again. Together with them and Rando, they now begin to plan to defeat Gama.
As the final battle begins, it is reveiled that Gama is no human warlord, but a ganin himself. Gamu and Gama fight but as Gamu loses his sword, Gama slices him in the head. Just as Gama is going to give Gamu the death strike, some ravens appears and pick Gama’s eyes. Gama screams in pain and as he’s trying to fight the birds off, Gamu graps his sword and chops Gama's head in two.
Rando and Gamu afterwards bury Gama to show that they had respect for their now deceased enemy.
- The Kagero Clan was originally hinted to be the ancestor of Iga Clan, but this was later changed and the ancestors were confirmed to be Iga ganins instead.