Musashi is the champion of fighting dogs in the middleweight class. Wilson tells the Ou pack about him and so they swim over to Shikoku to meet him. The Kai brothers go out at night and try to talk to Musashi, but he breaks through the cage and attacks Akatora. He lets go of Akatora and grants him amnesty for having courage to challenge him when his owner is about to go outside. Musashi later saves Akatora from Bills group of dogs and meets up with the Ou pack on the island. He returns at dawn with fighting dogs while Ou is dealing with Sniper and Bill. Musashi asks Bill to let the Ou pack to solve out their issue with Sniper on their own and Bill agrees.