What, I'm Guinevere?

[Completed] Couldn't find a picture of Guinevere, so I used her king instead. After transmigrating to the age of King Arthur in Great Britain, she is told that she will be the calamity queen who brings about the collapse of the Round Table and the fall of the kingdom. But she simply adores that petite, golden-haired person. Summoned in the Fourth Holy Grail War, she joins hands with the King of Knights, and together they bring down the King of Heroes. At the Singularity of the Divine Realm of the Round Table, she raises the banner of rebellion against the Lion King!

P.S.2: British History Arc (complete) -> FZ (complete) -> Divine Realm of the Round Table (complete) -> FA Adaptation (complete) -> Absolute Demonic Front (complete) -> FSN (complete) -> Fairy Round Table (final arc, ongoing)