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Chihiro Aoyama (青山 ちひろ (あおやま ちひろ) Aoyama Chihiro) is a high school student. A student at Fudo High School who went missing 10 years ago in 1983. She belonged to the Mystery Novel Club (currently the Mystery Research Club). She goes missing while investigating the six school mysteries.
Her disappearance was the catalyst for this incident.
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- Chihiro's surname Aoyama means "blue, green" (青) (ao) and "mountain, hill" (山) (yama).