In the bizarre "present world", humans, monsters and demons coexist according to the ancient "Three Realms Peace Contract". Maintaining this fragile peace requires a powerful arbiter and enforcer - the "Devil Management Bureau". Its founder and top manager is the mysterious and powerful half-demon **Yao Nagi**. He won the awe (or fear) of the three tribes with his unparalleled strength and absolute justice. The **five guardian demons** under Yao Nagi's command, each with powerful abilities, are the cornerstone of the Management Bureau and his only "family". During a routine border patrol, Yao Nai accidentally "picked up" His Highness the Nine-tailed Fox Tribe, a young man named Hu Qi who was new to the world and was ignorant and causing trouble. This innocent little fox with a secret that is not known to the public not only disrupts the cold order that has remained unchanged for thousands of years, but is also like a beam of light that shines into the closed heart of Yao Nagi. At the same time, it also quietly reveals the turbulent undercurrent under the calm water.
