Dongfang Xu is an ordinary college freshman. Although he has been an orphan since he was a child, he is sunny and handsome, takes people and things seriously, and is optimistic about everything. In an unfair incident, he discovered his differences, and was later told by a witch that he was actually the reincarnation of Satan, the king of demons. His mission is to gather the seven demon kings of hell and find the fragments of the wand scattered in different time and space. In the process, he will encounter all kinds of demons, ghosts, wizards and gods of death, etc. After many adventures, his ultimate goal is to re-maintain the order of the three realms and maintain the "devil's law"...