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

Plot
Setting on stage of modern Japan which walked the history that is delicately different from the reality, are the 7 Kings who are at feud with each other, and the fate of a boy who gets drawn into battles of strange abilities. “Red King” Suoh Mikoto who is leading HOMRA, and “Blue King” Munakata Reisi who is leading SCEPTER4 are both chasing after a suspect of a certain case, Isana Yashiro, who has to face them one round after another. However, Shiro who is not guilty in the case, will run about this way and that way from both groups without knowing anything. And then appearing before Shiro is a long-haired boy wearing all black, Yatogami Kuroh.

Official
Official Website