The Demon Realm has seven deadly sins: lust, envy, greed, gluttony, sloth, wrath, and pride.
A young man acquires the Demon Emperor Development System. He has no plans to scheme, fall into ruin, slaughter humanity, or destroy the world. Instead, he is determined to become a different kind of Demon Emperor.
The planned settings for the story include A Silent Voice, Chihayafuru, Just Because!, The Ryuo's Work Is Never Done!, Xialan, The Legend of Qin, and the first volume of Jin Guang Puppet Show. Characters include Luo Tianyi, Hatsune Miku, the ordinary heroine, Qingchun, Jing Kawaii, and, later on, Super Beast Force, Code Geass, and Armor Hero.
Cui Shaoyun looked at his father-in-law, Luo Yang, Emperor of the Celestial Empire, who was blocking his way, and smiled.
