Tea and Blood: the Record of the Demon King of Annihilation

"The black dragon appears, and the northern border is divided. Wherever the blood comes, the war will never stop." He was destined for disaster in the prophecy, but he grew up to be the gentlest green-shirted guest in the human academy. I wake up in the morning to make tea and hold a scroll under the moon. I am filled with a bookish atmosphere for ten years. When the demon blood in the body begins to awaken, when the former bookishness is replaced by violence. How will this demon prince who grew up in the human race hide himself? What kind of legend will be written?