Chinese web animation by artist MTJJ. A feature-length prequel named The Legend of Hei was released in 2019. A prequel webcomic Lanxi Zhen ("Blue Creek Town") is also available.
The story follows Luo Xiaohei, who, formerly stuck in the form of a cat, had to deal with life as one. The story also follows Luo Xiaobai, a girl who adopts the cat Xiaohei.
