He is a paranormal researcher and the highly intelligent 17 year-old manager of the Shibuya Psychic Research center. The nickname "Naru" is given to him by Mai, and is an abbreviation of the romanization of the English word "narcissist"; this nickname generally comes to be adopted by everyone working with the SPR. Initially, it appears that he has no spiritual powers. Though appearing cold and critical in front of his friends, he does care for them deeply and earns their trust and respect. Eventually, it is revealed that Naru is actually the famed paranormal researcher and psychic, Oliver Davis, and that he has very strong psychokinetic abilities, which Masako Hara has witnessed. Although Naru has been taught how to manage his psychic abilities by Lin Koujo, it takes such a large toll on his body that the one time he does use it in the series, he collapses and is hospitalized afterwards. It is also revealed that Naru had a twin brother named Eugene, who originally helped Naru to control his abilities. They were nicknamed Gene and Noll; when Mai gives him the nickname Naru ('Na-ru'), he is taken aback because (in Japanese) it sounds similar to Noll ('No-ru'). Naru and his brother were orphans who were later adopted by the Davises, paranormal researchers in England. Naru learns that his brother has died, and using psychometry, is led to Japan. It is discovered that Gene was run over by a car driven by an unknown woman, and his body was thrown into a lake to destroy any evidence of the accident. In the anime television series, Kazuya Shibuya is voiced by Yuuki Tai in Japanese and Todd Haberkorn in English.