Fourth season of .

In Edo period Japan (1603 to 1868), a strange new disease called the Redface Pox has begun to prey on the country's men. Within eighty years of the first outbreak, the male population has fallen to a quarter of the total female population. Women have taken on all the roles traditionally granted to men, even that of the Shogun. The men, precious providers of life, are carefully protected and the most beautiful of the men are sent to serve in the Shogun's Inner Chambers.

After being reborn in ancient times before the Great God-Conferment War, Li Changshou became a small cultivator. To survive in the cruel Primordial Times, Li Changshou tries hard not to accumulate any karma. He always plans thoroughly before doing anything and never allows himself to walk into dangerous situations. He hides his trump cards well, trains himself in escape techniques, refines poisonous pills, and masters mystical abilities. Li Changshou originally planned to remain hidden and safe in the mountain until his ascension to immortality. However, everything changed one year when his master brought home a junior sister…

Anju and Zushioumaru live a peaceful life in rural Japan with their kind and gentle father—the steward of the emperor's hunting grounds who teaches his children to respect nature and protect animals. The local lord frames him for burning the hunting grounds; Anju and Zushioumaru, along with their mother and a few animals, escape to Kyoto to ask the emperor to pardon their father. However, Anju and Zushioumaru are separated from their mother and sold into slavery after being tricked into boarding the wrong boat. Their cruel master forces them to perform extreme acts of hard labor under the threat of torture. Fortunately, Saburou—their master's son—is sympathetic to their plight. The siblings wield no weapons and constantly fear the punishment for unobedient slaves. Under these unfortunate circumstances, they must desperately work to regain the happiness they once had.