Cinderella was a nickname given by her family which came from the word 'cinders', meaning 'ashes'.
Her original name was 'Ella'.
There was a fan-made version of it in a novel.
' The Tragedy of the White Flower '
It went famous.
To sum everything up,
Instead of Ella getting her happily ever after, she got a tragic ending.
She was abused and neglected.
When she found 'her' 'loyal' prince, she was happy.
On the night of their wedding,
Her prince cheated on her with her sister, Anastasia.
She was shunned aside.
She was raped by him on the night of their wedding later and multiple times during their consummation nights.
She was made Empress by title.
She did all the work while the 'prince', now 'Emperor', spent his time with his beloved consort, Annabelle.
She tried to get help from her family.
But they threw her out of their priorities and treated her coldly.
The emperor couldn't just 'throw' the Empress of her seat as the Empire's people loved her dearly for her diligence and sincerity.
Anastasia got greedy for power and prepared a staged set-up to accuse her of cheating with a servant and treason.
Anastasia was made 'Empress'.
Ella got executed by brutal methods.
They tortured her till she fainted and used divine power to heal her and repeat the same process, over and over again.
They broke her limbs and burned her body to ashes.
...
'The only thing that was left of her was a white rose tainted with blue blood.'
...
Of course, this line wasn't a part of the novel. But it had happened.
Ella muttered something that changed the laws of their world before she died seconds later. "I will make sure everyone who had ever wronged me die and get tortured 100 times of what I had been through. I... WILL... GET... MY... REVENGE...!"
And that's how Itsuki got killed at that very moment.