On July 23, 1989, Miyazaki attempted to insert a zoom lens into the vagina of a schoolgirl in a park near her home and was confronted by the girl's father. After fleeing naked on foot, Miyazaki eventually returned to the park to retrieve his Toyota car, whereupon he was arrested by police who had responded to a call by the father. A search of Miyazaki's two-room bungalow produced 5,763 videotapes, some containing anime and slasher films (later used as reasoning for his crimes). Interspersed among them was video footage and pictures of his victims. He was also reported to be a fan of horror films of which he had a collection. Miyazaki, who retained a perpetually calm and collected demeanor during his trial, appeared indifferent to his capture.
The media called him "The Otaku Murderer". His killings caused a moral panic against otaku, accusing anime and horror films of making him a murderer. These reports were disputed. In Eiji Ōtsuka's book on the crime, he argued that Miyazaki's collection of pornography was probably added or amended by a photographer in order to highlight his perversity. Another critic, Fumiya Ichihashi, suspected the released information was playing up to public stereotypes and fears about otaku, as the police knew they would help cement a conviction. Miyazaki's father refused to pay for his son's legal defense and committed suicide in 1994.