The Sanjiyan-Unkara, a legendary race of three-eyed immortals, have been reduced to their final survivor. With his dying breath the archeologist studying them sends the last one, the childish Pai, to find Yakumo, the son he had left behind in Japan, who is to help her become human. Though initially put off by the situation, Yakumo finds himself dying to protect Pai from harm – and then his story truly begins. When Pai opens her third eye her Sanjiyan personality takes over, making her a powerful enough sorcerer to bring Yakumo back to life as a Wu, an immortal zombie linked to the fate of Pai; when she becomes human, so will he regain his humanity, but should she die, so does he. Attacks by demons seeking the Sanjiyan's immortality soon prove that Yakumo cannot return to his normal life, so he eventually agrees to help Pai. While seeking a statue necessary for the ritual that will make her human, Pai and Yakumo get caught up in a scheme to resurrect Kaiyanwang, the godlike individual responsible for the destruction of the rest of the Sanjiyan. Yakumo also gradually comes to realize the he is developing feelings for Pai, feelings which only grow stronger when she disappears for four years after a climatic fight only to reappear under a new identity, suffering from amnesia.