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In Shizume city there's a legend about a red king with demon-like abilities that single-handendly created the Homra organization, as long as you get accepted into Homra, you can gain extraordinary powers.

Yatogami Kuroh has lost the only thing remotely close to family he had left—and to make matters worse, he's been charged with a final task by his master that he isn't entirely sure he'll be able to fulfill. Follow this young modern-era samurai as he sets off on a quest to track down the next Colorless King and determine if he's evil or not…and to strike him down where he stands if he is.

Tokyo Regional Legal Affairs Bureau Census Division, Annex 4 also known as SCEPTER 4 is a police institution that aims to stop criminals with special skills. But for them, their real target are... ?

The story takes place in a world where seven people with unusual powers are crowned as “kings,” and revolves around the “bonds” and “fate” between the people involved. (Source: Anime News Network)

Shiro and Kuroh are not the only ones who go to high school. Instead, the members of Homra (including their leader Suoh) and the members of Scepter 4 attend school together. The students are sometimes lax, but at other times, they are hot-headed.