What's Wrong with Laying Low as the Demon King's Heir?

The first thing I saw when I opened my eyes was that I was an abandoned child.

My older sister, who came from the demon realm, told me

that I was actually the heir to the Demon King.

But I had already joined an immortal cultivation sect,

so I had to keep an extremely low profile.

By chance, I picked up a lucky System in the sect that I could bind myself to.

Completing missions would randomly drop items.

What? This drop is an ancient stone hammer?

This time, it dropped a spatula from the War between the Immortals and Demons?

I think I picked up a pretty unreliable System...

Keeping a low profile in the sect means nobody will take you seriously.

How could the demonic source inside me just sit around and wait?

I have to get cultivation resources for myself!

First, pull on some immortal-clan pantyhose as a mask,

then grab the ancient stone hammer,

and raid the sect's secret realm!

Getting something for nothing is the ultimate dream!!!!

Meanwhile, the other soul inside me

is slowly, bit by bit...

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.