Upon reaching Xian, Otaru comes down with a serious fever called the “sleeping fever,” which the marionettes are told can only be cured by a rare moss that grows in the mountains. In the process of looking for the moss, the girls become separated and are attacked by mysterious robot assailants, which turn out to be working for Doctor Hess and his Xian associate. This time, instead of Lorelei, it is the marionettes’ brains they attempt to scan, but a security measure within the maiden circuits kicks in and creates feedback within Doctor Hess’ machine, causing a tremendous explosion.