Diavolo needed another exchange student in the human world to strengthen more the relationship between demons, angels, and humans. Lucifer was then tasked by Diavolo to choose among the documents of students he had given. Lucifer chose the peculiar student that he first saw. "Cale Henituse, 18 years old. . . from South Korea? Hm, I will give Yuki a task to teach this new human with Mammon about Devildom." __ Yuki is a default female name in Obey Me, so I'll be using it. THIS IS ONLY A FANFICTION. LOUT OF COUNT'S FAMILY AND OBEY ME! SHALL WE DATE? AREN'T MINE.