Hiro enters Hougen's territory while travelling and encounter's his men who he fights. He castrates one of the two perimeter guards and they run away from Hiro. Somehow Hiro caught word of Hougen fighting Gin of Ou and wants to check it out for himself. He later makes his way to Hougen's house and defends Reika who tries to escape. Hiro aims to castrate Hougen, but he leaps over Hiro and threatens to kill Reika if he retaliates. Hougen's men beats up Hiro and brings him to where injured Gin and John are. 

Tomi, Roshi and Lefty show up to come save Gin and John. They also want to save Hiro but he says he doesn't like working his group. He changes his mind when he hears Gin and John talking about saving Reika. Gin cares so much about his friends and is willing to risk his life for those he cares about. Hiro had no idea how kind of a soul Gin had until then. He offers to help them save Reika. When they escape, he asks John to promise him that he won't die because John wants to split up. It is inevitable Hougen's men will go North towards Ou (the direction John and his followers are heading). Hiro heads West with Reika and they meet up with Weed's group. They show up as John is dying and Hiro tells John that the odds are turning in Ou's favor to bring him peace while he dies even though it actually isn't happening.

In the manga Hiro settles down with Reika and they have four pups. Three males, Kin (the one that resembles him the most), Tama (golden like him but with lesser brown ears) and Shou, who greatly resembles Reika and one female, Ami, twin of Tama.

In GDW:O, Hiro is among those captured and locked in a shed by Kurohabaki Jinemon. He is later saved and released into the mountains with his wife and children.

In TLW, Hiro fought against Moonsoon's bears and get wounded, only to follow Gin and getting fatally wounded by Moonsoon himself to protect Gin. The deceased Hiro and Gin fall down a cliff and get later fished up by a children and his father whose hooks got stuck into Hiro's corpse.