Blending CGI with traditional animation, and creating an rich, diverse atmosphere, Heat Guy J adds a new face to the genre of police stories.

Residing in Judoh, Daisuke Aurora is a cop employed by the City Safely Management Agency. Working for a small task force known as the Special Unit, set up to deter future crimes, Daisuke is partnered with the only android allowed in Judoh. His name...is Heat Guy J. Known as J to his friends, Daisuke and he form a formidable pair capable of handling anyone who trangresses the law.

Unfortunately, they have their work cut out for them. Their unit only has one other employee: Kyōko Milchan, who is the unit's office help. Plus, Judoh is a big place. Set on a huge island, Judoh is a massive city-state with a population far exceeding any city in the modern world. Not only is Judoh huge, but it has its fair share of criminals and criminal organizations.

Most of these organizations, or mobs, are under the control of the Leonelli Family. Acting under the title of Vampire is the new young master of the family: Claire Leonelli. With his father, the former Vampire, having recently passed away, Claire must work diligently to secure his future as Vampire. Doing so would make him the ruler of Judoh's underworld.

Claire will have his work cut out for him as Daisuke and J are already keeping tabs on the new Vampire to insure that Judoh remains safe from the Leonelli Family.