Kusumi Chiharu gets a message one day that he has been selected as a Monster Tamer, and he is prompted to select his first partner. He thinks little of the message until he receives a giant package the follo...

The Demon King rules over all demons, and using his immense power, put the human race through 1,000 years of oppression. Thus, the human's era has ended and the demon's era has begun. Lucifer has inherited ...