Iguchi was the owner of Ben.
He was a goodhearted man. He cares about his dog very much and occasionally hunts with him.
One time while in Mie, Iguchi shoots an animal he believes to be a flying squirrel but it turns out to be a dog. Iguchi puts the dog in cage, amazed by its jumping skills, and in hope of training him. However, Ben lets him free.
Some years later, Ben left Iguchi and joined Ōu Army. He returned back to Iguchi to get his eyes cured. Ben leaves again after the treatment.
Iguchi sees Ben after over 10 years. Ben shows up to his house, carrying a dead German Shepherd. Iguchi guesses the dead dog is Ben's friend and buries him in the nearby forest and gives him a funeral ceremony. While Iguchi goes back inside, Ben stays with the body whole night and then returns to Iguchi.
Iguchi decided to keep his old dog. However, Cross shows up and takes Ben away, leaving Iguchi again alone without his dog.