Sai Youki

As human evolution halts and the species faces extinction, Akane and her group seek mastery to obtain a legendary scripture. During a mission to exorcise spirits in a village, Akane discovers an unconscious man in an abandoned mine filled with youma. The man has no legs and lacks the orb that marks him as human. One of Akane's companions recognizes him as the abandoned prince of Sai. Despite her companions' expectations, Akane decides to bring him along. They continue their journey, encountering youma unlike any they have faced before.