“I am the only one in heaven and earth!” Chi Yu-rang, the Heavenly Demon and the greatest in the martial arts world, is trapped on the mysterious island of “Magyeong” by an unknown force.

While living in solitude for ten years, she discovers through a mysterious device that four worlds have merged.

To communicate with the world and survive, she resolves to undergo a transformation of her true self…

“Thank you, Meow, Meow!”

Reborn as a beautiful Heavenly Demon girl, Chi Yu-rang—or rather, “Heavenly Demon-chan”—will she be able to conquer the Kwitch and escape Magyeong?