Read Your Majesty, Please Don’t Kill Me Again Manga:
 
It was the end of a sunny summer day. In the hands of the tyrant, father, mother, brother and my neck went under the guillotine.
And when I opened my eyes, it was my 12th birthday.
Before the 13-year-old young Emperor became a brutal tyrant, I had to somehow become a god next to the man.
"I’m your maid of honor, so I’ll follow you.""I more.. don’t have much. And I don’t own you."
To live and to save my family, I have to be in the eyes of that tyrant who didn’t believe in humanity.
Only then I can live.
But that horrible monster is starting to change.
"I save what I lose in my hands. So don’t hurt yourself without my permission."