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.

Cute High Earth Defense Club LOVE! is a 2015 magical boy anime television series created by Kurari Umatani and produced by Diomedéa. The series is directed by Shinji Takamatsu and written by Michiko Yokote. The series premiered on January 6, 2015. The anime is licensed by Madman Entertainment in Australia and New Zealand and by Ponycan USA in North America. Funimation and Crunchyroll are currently streaming the anime. A second season of the anime began airing on July 7, 2016.