She is one of the "Nightmare Dolls", the gargantuan dolls in forms of young girls. Originally, grudge of the dead is used as souls of Nightmare Dolls, but "Catherine" is a being quite irregular. She is animated by the thought left when a water spirit dissipated, and strictly speaking, that isn't a soul. Before the ritual of soul possession was held on Catherine, she had already been possessed by the spirit's thought. Although that was merely a thought, the human soul used in the ritual couldn't oppose the residue of a spirit and dissipated. From that day, she became the first Nightmare Doll with spirit inside. Surprisingly, Catherine had attracted great popularity as a doll which could use magic of water herself. However, she plays pranks as soon as "Brenda" is not around, and she must be watched over.
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