Japan has reclaimed its former glory under the guidance of Kings, charismatic individuals wielding incredible powers. But now, one of the Red King’s vassals has been murdered, and a viral video shows the killer’s confession at the scene. He is one Yashiro Isana, claiming to be the Colorless King; and he is now a wanted man – not only to the Red King’s faction, but also the Blues charged with keeping the peace. He is even sought by Kuroh Yatogami, a knight of the former Colorless King sworn to slay any unworthy successor. Only, the subject of their struggle, “Shiro”, is a nondescript young man living an unremarkable life in an island academy, and seems to have no recollection of killing anyone. To keep his life, Shiro must prove his innocence; but what is the truth behind his mysterious past, and what will be the outcome of this confrontation of Kings?