In an otherwise ordinary modern city, a perfectly average boy—Eiru—was living his carefree life.

But two years ago, everything changed. Staring at the silver-haired girl in the mirror, the boy fell into utter confusion.

Horns? A tail? Wings? These aren’t things that belong on a human! What? I’m the Demon King?!

This is the story of someone who inexplicably turned into a girl, inexplicably became a Demon King, and now must live hidden in a modern city, concealing their identity…