Ghost Hunt follows the ghost hunting adventures of Mai Taniyama, a first year high school student, who becomes involved with the Shibuya Psychic Research Center (SPR) and its young manager, Kazuya Shibuya. When Mai accidentally injures Shibuya's assistant Lin Koujo, and breaks an expensive video camera being used by SPR in an investigation at her school, she works as a part-time assistant with SPR to repay her debt.
Mai nicknames Kazuya Shibuya "Naru" because she believes he has a narcissistic attitude, and the nickname is generally adopted by all those who come to eventually work with SPR on their paranormal cases: a Buddhist monk, Houshou Takigawa; a shrine maiden, Ayako Matsuzaki; a famous psychic, Masako Hara; and Catholic Priest, John Brown. Later in the series, they are assisted by a third-year high school student, Osamu Yasuhara (who works as an assistant beside Mai) and by Mori Madoka, Naru's mentor.
Ghost Hunt also explores the paranormal abilities of the characters, particularly focusing on Mai's "latent psychic abilities," demonstrated by her dreaming about information relevant to their cases. She is often joined in her dreams by someone who she assumes to be Naru acting as a spirit guide, but whom is later revealed to be someone quite unexpected.
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