Fujiwara Masako, as a modern person in the 21st century, traveled to the feudal Heian Kyo era.
And she was not tricked by the eldest lady of the Fujiwara family, and got engaged to the sick man of Ubuyashiki. In a fit of anger, she released the monster "Hannya", and after wiping out the family, she moved into the Ubuyashiki family as an orphan, in an attempt to take revenge on the family who dared to plot against Mrs. Fujiwara.
That's right, she is such a good woman who will report her flaws without any pretense.
Concept: A good fiancée is a good woman