Kiyoshi Kurotani is a first-year student at Kokatsu Academy who has an invested interest in the supernatural. A cognitive manifestation of Kioyshi as a phantom idol was created by Merope from Nagisa Kamishiro’s cognition, also known under the codename Key. He considers himself as "the chosen one" and claims that he possesses some kind of special powers, but at a cost of having difficulty making friends. Born with a weak body subject to illness, he has spent most of his childhood alone reading different kinds of books. Even now, he still has deep interest in fictional worlds.

Voice Description: Medium-high male vocal range. Shy, but assertive. When presented with a topic he enjoys, his personality can almost flip in an instant.