Muhyo & Roji's Bureau of Supernatural Investigation also known as simply Muhyo & Roji, is a Japanese manga series written and illustrated by Yoshiyuki Nishi. The series ran in Shueisha's Weekly Shōnen Jump from November 2004 to March 2008. It follows Toru Muhyo and Jiro "Roji" Kusano, a young magical law enforcer and his assistant, as they track down and punish spirits based on the articles written in the book of magical law. The individual chapters of the series were collected and published in 18 tankōbon volumes by Shueisha.

Yū Hayashi is a Japanese voice actor and singer from Kanagawa Prefecture attached to Ken Production. Formerly a child actor attached to Gekidan Himawari, he mainly specializes in dubbing roles. He is vocalist of Screen Mode, a band signed with Lantis.