"Cāo Gē Tiānxià" is Sleep Civet's first original VOCALOID work and is inspired by "Quan Yu Tianxia", an original composed by Wugui. Sleep Civet was given the permission by the staff members of "Quan Yu Tianxia" to create this song. The song is about Cao Cao, another emperor during the Three Kingdoms Period of China. This song exceeded 100,000 views on bilibili.