Shintarō is a member of Kyōshirō Shirogane's pack.
He was left with the Kōga Elder along with the other puppies from his pack.
Later he and the others joined the fight against Victor and the other Russian Army Dogs.
He participated in the battle against the hybrid bears.
Shintarō and the Ou army have caught in the volcanic eruption. He survives and is one of the Ou army Kurohabaki Jinemon locks the mine.
Later, the dogs are released and they participate in the final battle Kurohabaki Masamune against the troops.