Traveling entertainers Yin and Ning are very close sisters.
Yin cares for her armless sister as they travel between villages, putting on performances of swordplay and dancing.
When they arrive in the ruins of a village, they find a mysterious bamboo writing strip.
The strip glows, and from within it a strange girl and a single sword appear.
Meanwhile, in the Taibai Empire bent on conquering the Shenzhou region, a boy name Zhao is working as a slave.
Zhou, who has been teaching himself engineering, meets a young girl one night.
It's a fortress powered by 
an unlimited power source
إنّه حصن يعمل بمصدر طاقة لا محدودة
Eine Festung, die wir in einer
Kuican-Ruine gefunden haben,
Es una fortaleza
con una fuente de energía ilimitada,
Es una fortaleza
con una fuente de energía ilimitada.
Une forteresse se mouvant
grâce à la Flamme noire,
È una fortezza alimentata
 da una fonte illimitata di energia,
É uma fortaleza que recebe energia
da fonte de energia ilimitada,
Это крепость, которая будет работать
на бесконечной мощи