Robin, Come Back to Earth with Me!

Transmigrated into One Piece as Sanji's fourth sibling

My brothers and sisters were all born with the standard hardware, their bodies covered in alloy skin.

And me? I'm just a weak nobody with no fighting strength.

At the thought, grief welled up inside me, and I lit a cigarette.

The next second, I shot straight into the sky, cigarette and all.

Congratulations! You've activated the Tempering System!