The two books are a continuation of the Evil Spirit Series (Akuryou), but in a different setting.

Ghost Hunt follows the adventures of Kazuya Shibuya, the president of the Shibuya Psychic Research Center (SPR) and Mai Taniyama, a first year high school student. The story begins during an exchange of ghost stories between Mai and her friends, who are interrupted twice: first by a mysterious "male student" and then by a fellow classmate, who warns them of how their ghost stories attract spirits. 
While out walking, Mai sees the building that all the ghost stories surround and decides to go in. As she is about to touch a camera she found in the middle of the room, a man stops her and ends up injuring himself. Mai is then forced to work as a stand-in assistant for the man, an employee of the "male student," who was hired to study the "paranormal" events occurring at the school. Mai nicknames this "student" "Naru" for his narcissistic attitude. Naru owns a paranormal investigation company SPR and Mai eventually earns a part-time job at SPR after assisting with the first case. The more involved Mai becomes with Naru, the more she learns about herself and her feelings towards him. 
Along with Shibuya's assistant, Lin, the SPR also finds itself assisted by various spirit mediums and exorcists. 
(Source: Wikipedia)

Midori's mother has finally acquired her dream home, but it isn't long before supernatural phenomenas disrupt the peace of the family. And if unexplained electricity failures, strange phone calls, and the eerie presence of spirits weren't enough, finding unexplainable blood in the bathroom becomes the last straw. Mai and Shibuya Psychic Research are brought in to investigate, but what horrors will they find in the 'dream' home that turns out to be nothing but a nightmare? 
Akumu no Sumu Ie - Ghost Hunt is based on a sequel novel of the original set several months in the future from the original Ghost Hunt. It was published in 1994 and was only two volumes long. 
(Source: Wonderland After Hours)

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