Maou no Shimobe ga Arawareta!

is a Japanese light novel series written by Yu Ueno, with illustrations by Isshin. The series began publication on March 10, 2012 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
On my 17th birthday, a black girl like a god of death came to me living alone. She called herself the four heavenly kings of the Demon King's army, "Thousand-blade Schwarzricht," who should have destroyed herself, and for some reason called me "His Majesty." Does that mean I'm the Demon King !?

I didn't fight at first, but in pursuit of Schwarzricht, who has the power to generate weapons from his own shadow, the big conglomerate's hungry lady, Kaname, and the government that looks like an elementary school student Agent Sakura appears, and my private life becomes extremely confused ──

What happens when these three problem children will live in my house !?

Demon King's servant The opening of the romantic comedy!