When a person has a near-eternal life, but has to watch tragedy repeat itself - what can he do? Mikage Yoruichi, an ordinary modern medical graduate student, accidentally traveled to Japan during the Heian period. He was touched by the fear of the dying aristocratic young man Tsuji Muzan, but he witnessed with his own eyes the bloody atrocities committed by Muzan when he transformed into a ghost queen. Ye Yi, who gained "immortality" due to Wuhan's blood, embarked on a thousand-year journey of watching. He is not only Wu Ke's "shadow", witnessing the birth and destruction of the Twelve Ghost Moons; he is also the "Moon Shadow" who protects humans in the darkness, training ghost hunters from generation to generation, and fighting against ghosts in unknown corners. He has seen the god-given talents of Jiguo Yuanyi, and he has also seen the pain of Hei Shimo's fall; he has witnessed the sad past of countless ghosts, and has witnessed the heroic sacrifices of countless pillars. He failed in "redemption attempts" again and again, and persisted in despair again and again. It wasn't until the Taisho era that he met the boy with a scar on his forehead and gentler eyes than anyone else - Kamado Tanjiro. This time, can the thousand-year tragedy play its final chapter before dawn?
