My Whole Family Is a Magical Girl, but I Am the Demon King!

Xiyue, 17 years old, is a senior high school student. His parents are still alive and he has a sister at home. He lives a happy life, but he always feels that he has been in a family crisis recently. My parents left earlier than usual and came back later than usual, and my sister disappeared all day long. I was the only one left alone in such a big house. However, just recently, he suddenly discovered that his parents were actually teaching his sister how to become a qualified magical girl! Fight against monsters, resist evil gods, stand as the protective light under the dark night, embrace the miracle of love and hope, the eternal morning star that everyone praises and follow, and the spear of justice that pierces the endless darkness... The various names of magical girls make Xiyue troubled. What to do, do you want to be hostile? He looked at the faint mark of the Demon King on the back of his hand. As the great Demon King of Gluttony, the Lord of Hell, the Lord of the Abyss who devours everything, and the successor of Beelzebub, the King of Flies, Xiyue fell into endless contemplation.