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.
What happens on nights when 
they can't proclaim their love?
ماذا يحصل في ليالٍ حيث لا يمكنهما
الإعلان عن حبّهما؟
Des Nachts, wenn sie ihre Liebe
nicht offenbaren können …
¿Y las noches
en las que no se declaren su amor?
¿Y las noches
en las que no se declaren su amor?
Cette nuit
où l’amour ne put être avoué…
Cosa accadde nella notte in cui 
non riuscirono a dichiarare il loro amore?
O que acontece nas noites em que
eles não podem proclamar seu amor?
А ночь, когда не смогут
признаться в любви?