A brief description of the manga I Was Told To Relinquish My Fiancé To My Little Sister, And The Greatest Dragon Took A Liking To Me And Unbelievably Took Over The Kingdom:
In the Kingdom of Treinville there is a custom that every ten years people must sacrifice an innocent girl to the Great Greedy Dragon.
She is called the “Bride of the Dragon”, dressed in a beautiful white dress, and then she is to be thrown into a volcano vent.
This time the Dragon Bride is the young Lady Eliana, eldest daughter of the Duke of Lumière. Her younger sister, the Moon, cunningly broke off Eliana’s engagement to Crown Prince Alvin and took her place.
Disgraced and tormented, Eliana voluntarily becomes the Bride of the Dragon, hoping to find peace in the arms of death. But things aren’t going as they were meant to.
is this up to date? is says ongoing but hasnt be updates since 2021
this feels like the backstory for the manga A Knight Does Not Blindly Follow Money
I found a Russian translation going up to chapter 27, and there is an official English translation currently reaching chapter 49, which is probably why English scanlation has been dropped:(global.bookwalker.jp/series/310320/chapter-releasemy-little-sister-stole-my-fiance-the-strongest-dragon-favors-me-and-plans-to-take-over-the-kingdom/)