The dark comedy revolves around the fierce god aide to the Great King Yama, Hoozuki. Calm and super-sadistic, he tries to resolve problems that often occur in Hell.

Hoozuki's Coolheadedness centers on Hoozuki, who works under King Enma. It is possible to say that the Japanese hell only functions because of Hoozuki, who manages hundreds of demons, greets delegations from other hells, and keeps King Yama, focused on what he is supposed to be focused on. However, he is not the only one to accomplish such an uneasy task--manage the whole Japanese hell; he also has many companions to help him. Hoozuki is, perhaps, the most efficient bureaucrat in the underworld, who actually invented the system of the modern Japan's hell.—Scientiiaa