Kaoru Kobayashi

was a Japanese newspaper deliveryman who kidnapped, sexually assaulted and murdered 7-year-old in Nara, Nara Prefecture, on November 17, 2004. Kobayashi, an ex-convict and pedophile with a record as a prolific sex offender, was sentenced to death for the murder of Ariyama and was executed by hanging at Osaka Detention House on February 21, 2013. Ariyama's murder caused a surge in the moral panic against otaku culture in Japan.