The Queen
She is Dorossel, the witch of love, there is 1 in each universe, like how there are specific witches as shown in the story. Iirc, the witches' powers are exclusive. She was the first witch to pull out the holy sword, Caliburn, and claim the throne.
Alfred/Zirconia
Zirconia was the mentor witch that was killed(?), she had found Alfred when he was a baby. They had friends and all, they were rebels against the tyrannical Queen Dorossel. Their happy days didn't last any longer as eventually, they all sacrificed themselves to help each other escape from pursuers, leaving only Alfred and Zirconia. Then, she too had to sacrifice herself. Her last words to him, "I love you." This man sets out for revenge just like our story.
Dorothea
Dorothea was on a journey to rescue her father or lighten his sentence after being arrested. I don't exactly remember much about her, but we get to know more later on. She is, indeed, the Queen that we know of now in The Kingdom Of Ruin.
(Skipping some stuff of their journeys)1) The Story
The story begins with these two meeting and have their journey due to circumstances.
At first, just like our Kingdom of Ruin, these two were like fire and water. Alfred on his path of revenge while Dorothea, probably somewhat like the fmc we know of, like Doroka. Eventually, they get to know more about each other on their journey.
2) The truth
Queen Dorossel wasn't actually the one who pulled out the sword. It was because of the baby in her womb. This baby inherited the power of the witch of love. (You may have been thinking, "but a witch's power is exclusive," well, the answer would be that the Queen is from a parallel universe, her child is the real witch of love for this universe). By now in the story, you should know who else is the witch of love, Dorothea. She is actually Dorossel's child. A child Dorossel had no choice but to have because of her plans.
Alfredo realizes that the girl he has been traveling with is the daughter of his sworn enemy. But, he still travels with her, guess he's already attached to her at this point.
(Also, iirc only a witch/woman(?) can kill the queen)
3) Finale
They reach their destination.
"We've finally made it this far."
"This is all her fault... my real mother."
Alfred stands close to Dorothea, trying to protect her from the people who look at her with fear and anger. Dorothea declares that she will restore the world to its former state.
Alfred looked back on their journey so far, and told Dorothea how her kindness had saved him so many times.
The two finally come face to face with Queen Dorossel.
The Queen looks at Alfred with an ecstatic expression and says that her whole life, even giving birth to an unwanted child, was all for the sake of getting her loved one back.
4)The End
Dorothea opposes the Queen, who is wielding the love spell "Armament (Ruin)," with the same love spell "Binding (Mandrake)."
However, Dorothea is defeated, and Queen Dorossel leaves with Alfred's head.
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Alfred believed that Dorothea would now be freed from his revenge and would bring kindness to the world.
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Alfred, who is now only a head, gently sheds tears. Dorothea wails and calls him a liar.
After obtaining Alfred's head, Dorossel heads to the Headless Knight seated deep inside the castle.
As she gently placed the incarnated head on that body, Alfredo's red hair turned pure white, and her beloved, unaware knight was brought back to life.
The knight calls Dorossel a princess, embraces her, and gently lifts her up.
Dorossel happily tells the knight that she has had a "little adventure," and the knight smiles kindly at Dorossel.
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Having lost Alfred, Dorothea embraces his headless body and makes a vow.
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She was going to bring him back to life no matter what.
Even if it means killing him in another world.
The end.