Due to the cruel nature of the emperor Kaal Lakin of the great empire Lancia, it always rains blood in his harem. Another concubine has died at his hands and was replaced by Erika Cor, the daughter of the lord of Northend. Seeing a cruel emperor and an infinitely fragile-looking girl, Erika, everyone predicts that she will not survive long in this harem, but contrary to everyone's expectations, Erika gradually discovers that a different figure lurks beneath Kaal Lakin's twisted surface. And Kaal also spends time with Erika, who seems weak, and feels his wounds healing. They feel affection for each other, but their status as the emperor and his concubine doesn't leave them alone as lovers...