The Legend of Luo Xiaohei (罗小黑战记) is a flash animation and webtoon developed by Chinese artist MTJJ (real name Zhang Ping 章平).

It has also been turned into a mobile game titled "Luo Xiaohei's Battle Demon Book" (罗小黑战记妖灵簿) by Beijing Manya Entertainment Culture Media Co.[6] The story begins on a rainy night when Luo Xiao Hei, a cat spirit, is badly injured after stealing Laojun's wish-granting pearl artifact, the Pearl of Heaven.

Once Xiao Hei is able to restore his spirit energy, he intended to leave Xiaobai and A'gen, but instructions from his master Wuxian allow him to stay with them a little longer.

Those instructions form the plot of the second season, where Xiao Hei is supposed to befriend a few humans and enter the world of the elfin-developed video game All Living Things in order to complete a particular vigorous quest.

The quest, as it is revealed in the latter half of the season, is actually a test for Xiaohei to prepare him for his prospective job as an Executor (a type of roaming enforcer for mainstream elfin society) and graduate from his apprenticeship.