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 derives from a animated series in March 2011 that was mainly broadcast online. The franchise has also extended to become a social media sticker series on WeChat. As of August 28, 2019, 28 episodes of "The Legend of Luo Xiaohei" are available alongside 3 extra videos, "Exam Day", "Sh…", and "Goodnight Meow". A feature-length prequel film named "The Legend of Hei" was released in Chinese and Japanese theaters in September, 2019.

The series was adapted into a graphic novel in 2015, published by Beijing United Publishing. 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..

The story begins on a rainy night when Luo Xiao Hei, a cat demon, is injured badly after stealing Laojun's pearl artifact. As a result, he is transformed from his humanoid form to become a black kitten. He is then saved by a young girl Luo Xiaobai and brings him home. Luo Xiaobai and Luo Xiao Hei become very close friends and their adventure starts in a world where people, goblins, and gods coexist.

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