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Muichiro, Emperor of the Empire. And Guest, a High-Ranking Concubine. In the Imperial Court, the status of concubines is divided into three ranks: Lower, Middle, and High. Emperor Muichiro has elevated his three most favored consorts to the High rank. One day, Hiyoshi Sako, one of the High-Ranking Concubines, becomes pregnant, and Guest also successfully conceives. Months later, Sako gives birth to a healthy Princess, and four months after that, Guest gives birth to a healthy Crown Prince. However... tragedy strikes. Both the Princess born to Sako and the Crown Prince born to Guest begin to suffer from unexplained fevers and difficulty breathing. The cause is white face powder containing lead. However, the physicians of this era are unaware of this fact. Consequently, the Princess and the Crown Prince grow increasingly frail, and their lives are in grave danger.