Billy was a member of Terry’s platoon and helped infiltrate Mutsu along with Hulk.
Ginga: Nagareboshi Gin
Being in the fifth platoon, lead by Terry, he together with platoon four and six was sent north. They came to meet the Four Heavenly Kings Of Mutsu. And was forced to either surrender or die. Together with Terry and other, Billy joined the Four Heavenly Kings. Till the day Moss and his pack came, and Terry got killed and a fight was about to break out. Just before the fight, Billy, together with Hulk and others from the platoons four, five, and six broke free from the Four Heavenly Kings and once again joined the Ōu army.