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Keiko is Mai's schoolmate with whom she was telling ghost stories with one other friend Michiru in File 1: Evil Spirits All Over!? .
Appearance[]
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Personality[]
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Trivia[]
- The name Naoko means "straight" (直) (nao) and "child" (子) (ko).
- Naoko's surname Kuroda means "black" (黒) (kuro) and "field, rice paddy" (田) (da).