In a world where spirits and humans coexist, He, burdened with the Soulslayer Sword, is an aloof young man. His mysterious encounters have left him with a solitary disposition. However, many years later, He inadvertently rescues Liruo, a powerful spirit who crossed over from the Spirit Realm. These two lonely souls find solace in each other's company. But one day, Liruo vanishes without a trace. As He embarks on a desperate search, he unravels the intricate web of connections between humans and spirits, as well as a colossal secret that binds him to Liruo.