In Tokyo, there exists a peaceful cohabitation between supernatural creatures—elves, dwarves, vampires, and more—and humans. However, contrary to history, powerful dragons once ruled over this world of creatures and humans but have since disappeared. Consequently, a diabolical group under the alias "Nine," who seek the miracles of the once godlike dragons, stirs up trouble in the streets of Tokyo, commiting mass murder and causing destruction. To combat the dangerous group of Nine, the police organize the Special 7—a group of highly skilled professionals whose abilities exceed those of ordinary humans. Caught up in a bank robbery turned hostage crisis, Seiji Nanatsuki, having recently become a detective, has a chance encounter with Shiori Ichinose, a member of Special 7. Assisting with the resolution of the robbery, Seiji is recognized for his clear sense of justice and refreshing character, suddenly earning him a spot on the elite unit. As he takes on new missions, Seiji finds that being a detective as part of Special 7 isn't the police work he expected, where working alongside a team of different species with special abilities and vibrant personalities brings unpredictability to his daily life and police work. While the everyday crime in Tokyo continues, Seiji and the Special 7 will fight not only to resolve special cases, but also obstruct the ill-intentioned plans of the merciless group of Nine. A long time ago dragons ruled a world of elves, dwarves, vampires, homunculi, and humans. In the present dragons have all but disappeared, so the ones left chose to live together, and their appearance came to resemble that of humans. The year 2x19 in Tokyo is mostly a time of peace, but a group called the Nine cause chaos in their quest to obtain the dragons' powers and change the world. The police form a unit consisting of various experts to fight against Nine; the Special Crime Investigation Unit - Special 7 (Tokunana). These individuals have abilities that surpass the average human, to the extent that there are rumors of rebellion against them. A rookie, Seiji Nanatsuki, enters the unit. While teased by other members with colorful personalities, he sets out to solve cases involving Nine with his bright mind and straightforward thinking. Will he be able to find justice in the most grueling circumstances?