Set in a modern-day Japan where seven 'Kings' possess supernatural powers, the story follows Yashiro Isana, a seemingly ordinary high school student who finds himself caught in the crossfire of a brutal gang war. After a video surfaces showing him committing a murder he has no memory of, he becomes the target of the powerful HOMRA organization and the disciplined SCEPTER 4 police force. As Yashiro flees for his life, he encounters the mysterious Kuroh Yatogami, a swordsman who initially intends to kill him but eventually becomes his protector. Together, they unravel a complex conspiracy involving the Colorless King and the true nature of the Dresden Slate, forcing Yashiro to confront his own identity and the dangerous legacy of the Kings who govern the city's fate.