He is the number one Tenryou Commission detective, harboring a rivalry with the Bantan Sango Detective Agency's Sango.

In Heizou's youth, he was rebellious and disliked following rules.[2] Despite calling himself a detective and serving the Tenryou Commission, his investigations revolve around his personal principles and appear to be unrelated to any governmental duty.[3][4] Heizou's view of the term "detective" mostly stems from his belief that one should be evil's natural enemy, as the damage