Akuma Kun, a boy raised by a demon, works with his half-human partner Mephisto III as paranormal investigators to solve various murder and mysteries.

Yuki Kajias Akuma-kun / Ichiro Umoregi (voice)
Toshio Furukawaas Mephisto 3 / Mephisto 2 (voice)
Ryoko Shiraishias Sanae Kazama (voice)
Yumiri Hanamorias Mio Kazama (voice)
Fairouz Aias Gremory (voice)
Yukiyo Fujiias Hina Asanagi (voice)
Michiyo Yanagisawaas Etsuko Umoregi (voice)
Yusaku Yaraas Satan (voice)
Hiro Shimonoas Strofire (voice)
Yuko Mitaas Akuma-kun I / Shingo Umoregi (voice)
Hiroyuki Yoshino