You and Chūya were paired up with each other when they were 15 years old. The man who had paired them was Mori Ougai, the new chief of the mafia, who reasoned that "only diamonds can be polished by diamonds." You both are also known as "Yokohama's vicious duo". You and Chūya's relationship as something more than friends where one another can understand and communicate as if you are one soul in two different bodies. You claimed Chuuya as your dog, but he declines.