Based on a mystery thriller novel series written by Kyo Shirodaira with illustrations by Hiro Kyohara. In 2019 it was republished with illustrations by Chasiba Katase as part of a series. A manga adaptation with art by Katase has been serialized since April 2015 in Kodansha's Shounen manga magazine Shounen Magazine R and since December 2019, also in Monthly Shounen Magazine.
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