Eigetsu Tou, a 13-year-old boy from a destitute wartime family, narrowly escaped filicide by fleeing to Seika village, where Dr. Ka Shin rescued him. Orphaned again when a snow fox parasite plague destroyed the village, he was adopted by Koku Province’s governor, Kai Yu, who funded his education and political career. Eigetsu harbors two personas: his timid, empathetic self and Yougetsu, a cunning, arrogant strategist emerging when he drinks alcohol. This duality originates from a childhood pact with the White Immortal Haku Byakuya, who saved Eigetsu from death at age four in exchange for eventual possession of his body, limiting his lifespan to 20 years. By 12, Eigetsu made history as the youngest jougen, surpassing luminaries like Li Kouyuu. Appointed co-governor of Sa Province with Shuurei Kou, he focused on transforming the region into a research center until a plague mirroring Seika’s outbreak resurged. Defying political opposition, he diverted resources to medical relief and traded a decade of his life to prolong Dr. Ka Shin’s survival, leaving himself one month to combat the epidemic personally. His bond with Kourin, a lady-in-waiting, deepened during their governance. He confessed his affection before departing to treat plague victims, exemplifying his self-sacrificing ethos. Though his methods quelled the crisis, the central government condemned them as reckless, demoting him to Kai Yu’s assistant. He later volunteered to mitigate a locust infestation in Heki Province, reaffirming his civic dedication. Yougetsu ultimately relinquished control, extending Eigetsu’s life by 50 years through self-imposed dormancy after witnessing Eigetsu’s unwavering resolve during a clash with Hyou Ren, a manipulative figure from the Hyou clan. This resolution underscored Eigetsu’s navigation of supernatural bargains and political intrigue. From traumatized orphan to driven official, Eigetsu’s journey intertwines personal sacrifice, bureaucratic reform, and reconciliation with mortality, anchored by his struggle to balance human fragility with transformative ambition.