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Mikado Chiaki is a high school boy who lost the ability to feel joy after a strange three-headed dog bit away a piece of his soul as a child. Years later, a mysterious package arrives from his father, containing a girl named Kuro who claims to be Cerberus, the mythical guardian of the underworld, with three distinct personalities sharing one body. Kuro declares herself Chiaki’s protector, aiming to help him reclaim his happiness, while her other forms—Shirogane and Roze—bring their own quirks and affections into his life.
