Kurohabaki Masamune is a ninja dog, the leader of the Kurohabaki Clan. He is the eldest son of Kurohabaki Terumune and Yamabiko's big brother. As a pup, his owner gouged his eye out and left him in the mountains to die (Later it was found out he got revenge by pushing his owner of a mountain cliffside).

Luckily, Terumune, the Kurohabaki Clan Leader, finds him and adopts as his own son. In addition, his followers respected him greatly and his father trained him relentlessly to become a strong fighter. For Masamune, this was a difficult task, but he didn't give up and tried his best to prove to his father that he was worth of a fighter. However, his long efforts were in vain when Yamabiko, who was to become his "younger" brother was born. From his birth, Terumune looked after Yamabiko more than Masamune and had already decided that his son shall succeed him to obtain the leadership of the clan.

This made Masamune angry and wanted revenge. He then banished his father and took the leadership of the clan. But his revenge wasn't accomplished, for he had to kill his younger brother, who was sent to Shikoku to avoid battle. After the volcanic eruption in Ohu, he takes over the utopia and convinces other dogs from nearby areas to join and strengthen his huge army of Kai-Kens.

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