Defeated Demon King, Living Off the Land as a Human Princess

I was reborn as the Demon King, so of course I had to change the world and make the demon race great again!

But just as I was about to set out, a girl hero blocked the door. Worst of all, I couldn't beat her. Not only did I become her defeated underling, I even lost my life...

But it doesn't matter!

I'll come back to life! All I have to do is lie low as a soul for a hundred years, wait for the hero to die of old age, and then I'll be free to do whatever I want!

Wait, what...?

There was too much magic power, and the spell worked too well. I came back to life after just ten years, and the hero is still bouncing around?

And on top of that, I've been reborn as a human princess who grew up far from home, with the hero's teacher, an unfathomably powerful grand sage, as my mother?

Winnie: ???

But luckily, I haven't lost the Demon King's power, and my subordinates in the demon realm are still loyal.

So...

In the demon realm, I'm the great Demon King, clad in black armor and standing over two meters tall.

In the human world, I'm a harmless, mischievous human princess.

Though I'm worn out from running around, life is still fun and fulfilling.

Until one day...

"Teacher, your daughter is very talented. I'd like her to become the new hero..."

The hero who had once defeated her came to visit and made a request that left the girl sitting on pins and needles.

Meanwhile, on the other side...

"Your Majesty, I hear the hero has taken on a disciple. To prevent trouble, we must eliminate her!"

"And that little human princess, too. I hear the people adore her. If she inherits the throne and unites all of humanity, we'll be in trouble!"

Winnie: ...

I'm tired. Let them do whatever they want. I'll just live off someone else!