Origin
Hades
One of the three heads of Cerberus. Shirogane stands for power, born of Roze's desire to be stronger (or rather her hatred of her own weakness). Even commonly powerful monsters like Ifrit are considered by her to be small-fries. Shirogane loves Roze deeply, and tries her best to protect Roze from all pain, physical and emotional, to the point where she believes Roze is the only reason why she exists. Indifferent and even condescending towards Chiaki at first, she eventually warms up to him after realizing his kindness.
Today's Cerberus
At a young age, a part of Chiaki Mikado's soul was bitten away by a peculiar dog with three heads. Unable to feel happiness and joy as a result, he lives his days deprived of positive emotions, faking smiles when the situation calls for it. Eight years later, his father sends him a box from Greece. Inside it is a girl with three forms and personalities: Kuro, Shirogane, and Roze. With the form of Kuro, she tells him that she will be Chiaki's guard dog. The girl reveals that she actually is the guardian of the Gates of Hades—the Cerberus—and is the same creature that tore his soul. But this time around, she will help Chiaki smile again. However, this task is no small feat. Due to the missing piece of his soul, Chiaki is a magnet for fiends and wicked spirits. Meeting rivals, friends, and foes along the way, Chiaki perseveres to regain one of the most important things to being human—the capability to feel.
