The strongest princess hides her real power

Defender of the empire, ‘hero’.
During a long period of time when the mountains and rivers changed countless times, the hero always protected the empire according to the orders of the imperial family.
There was no suitable name. People didn't even know if heroes existed, so there was no honor or praise.
The hero was a dog kept on a leash by the imperial family.
After sealing the light dragon, the hero who had been sealed in the royal family opened his eyes again.
It was 10 years later.

At the wedding hall, into the body of today's bride, Rosanne, the illegitimate daughter of Duke Leilathen.
Even though the body changed, somehow the power vested in the hero's soul remained the same.
Even the hero didn't know how this happened.

I just hoped.
I hope I never lose this sweet freedom I finally gained.

“Today’s wedding is cancelled, Duke. “My opponent, the Marquis Gicellia, is a pervert, and I don’t like perverts.”