Tantei Team KZ Jiken Note is a Japanese children's novel series written by Hitomi Fujimoto and Ryō Sumitaki, and illustrated by Komagata. Kodansha has published twenty volumes since 2011 until the last chapter in February 2016 issue of Nakayoshi magazine. An anime television series adaptation by Signal.MD began airing from October 7, 2015, to January 27, 2016.

Koutaro Nishiyama is a Japanese voice actor and singer from Kanagawa Prefecture, Japan. He is currently affiliated with 81 Produce. His major roles are Atsushi Kinugawa in Cute High Earth Defense Club Love!, Sakutaro Kirara in Jewelpet: Magical Change, Kazunori Uesugi in Tantei Team KZ Jiken Note, Yoshiharu Hisomu in Kiznaiver and Ryūichi Kashima in School Babysitters. In 2018, he won the Best New Actor Award at the 12th Seiyu Awards.