Shouji Sudōu is a one-eyed retired policeman who has an intense hatred for the Great Danes Hougen and Genba.

3 years ago, he and his partner, Tanuma, were in the Southern Alps on a mission to capture a criminal. There they found an abandoned kennel. As they inspect it inside, they saw Hougen and Genba standing on the pile of dead bodies eating a dead human. Then, the hungry dogs attacked the policemen. Though Shouji only lost his left eye, Tanuma was mercilessly mauled to death by Hougen and Genba. Fuelled with hatred, Shōji swore to hunt down and kill Hougen and Genba for the loss of Tanuma. Shouji was first introduced in the story when Daisuke and Hidetoshi were having a discussion about the dogs. Daisuke and Hidetoshi realized who Weed was really dealing with when Shōji showed them the photo of Hougen and Genba. Shouji, Daisuke and Hidetoshi went to discuss with the town council who came up with the solution to deal with the wild dog problem: bomb Gajou mountain. However, the plan did not work and it turned out that Hougen was still alive. 

Dissatisfied with the council, Shouji went off alone to hunt down Hougen all by himself. In the end, he finally found Hougen, heavily wounded and tired from the battle with Weed. Without an ounce of mercy for the defeated dog, Shouji shoots Hougen straight through the head several times with his rifle and avenges his friend.