A high school girl, Ameng, has a secret. She thinks she is the only cat demon in the world. She often transforms into a cat and rules the cat world with her friends! Until one day, she unexpectedly discovered that her classmate Xiao Yi was also a cat demon, and she slowly revealed the truth... It turned out that the humans around her were not all humans, nor were they just cat demons. Everyone just hid their identity as half-orcs... So what is the meaning behind the story? Why do orcs exist? What is the real mission? What is the other world of orcs like? Will the destruction of the human world come true? How to find out the truth when faced with the mysterious death of a friend? Who is the final boss?