Yuru's quiet life comes to a sudden, bewildering end when his mountain home is attacked...by none other than his twin sister Asa! Forced to assume the role of Daemon Wielder, Yuru manages to escape with the help of his new allies. But while they seek to keep him hidden, Yuru seeks answers, a search that puts him on a collision course with Asa and her mysterious co-conspirators, the Kagemori clan...