The Knight of the Conan World

A note beforehand: The Arthur in this story is an ordinary person, with no invincible combat prowess. None of the Knights of the Round Table who appear here have the power of heroic spirits either, so please keep that in mind before reading.

I'm digging another hole. I really have no choice when there's nothing to read, so I have to write it myself. That's the gist of the blurb.

The counterfeit King Arthur followed her destined path and vanished into the river of history. When she opened her eyes again, she found that she had transmigrated once more (been reborn?). Then she realized her sister's name sounded familiar, and the Akai family next door seemed rather mysterious too.

More than ten years later, her sister had become a renowned queen of the turf, while her master had somehow become even younger than she was...

The pairing is undecided for now. I absolutely love both Vermouth and Shiho, but I only want a one-on-one romance.