Kaka is a little girl with abnormal physical strength who used to live with her master, Genjou, on the outskirts of a village far away from the capital. When the village is burnt down and its inhabitants are all turned into monkeys by demons, she leaves with Sanzou, in possession of her master's body, in order to bring all of her loved ones back. Kaka's muscles of steel are combined with a fierce resolution and a kind personality, within the limitations of a child. She always talks about herself in third person.

Spoiler

Before being possessed by Sanzou, her master left Kaka a protective band.