"Spirit Cage: Incarnation", (and also referred to as Ling Cage) Ling Long Incarnation is a fully CGI post-apocalyptic Chinese Donghua series made by YHKT Entertainment, and it depicts the brutal reality of the Lighthouse, a flying city where the remnants of humanity took shelter decades ago, after recovering from a disaster that unleashed horrific monsters upon an already overpopulated world.

Subsequently divided into those possessing desirable and undesirable genetics to ensure their survival, draconian measures are taken to prevent any contamination and emotional connections from compromising the future of their refuge, while teams of elite hunters scour the surface wilderness on dangerous expeditions to find and return precious resources home past hostile, and monster-occupied, territory.

In the not-too-distant future, the human world has long been overpopulated. Humanity marched to the stars in search of a new home, and just as this was going on, the moon's alignment caused massive earthquakes to ripple across the world, lasting several decades. Humanity was demolished. When the land finally recovered, humanity reemerged to face this strange yet familiar world. Will we, who once lorded over this domain, still remain the masters of this world?