The Sharingan, You Know?

Rider Medusa.

Although Kaoru Sakura had met her only once, Medusa had left an extremely deep impression on her.

Back when Kaoru Sakura was still in high school, she had merely been an ordinary person who knew nothing of magecraft.

At the time, Fuyuki's Fifth Holy Grail War was underway, and Medusa, who had been summoned as the Rider-class Servant, attacked the school.

Kaoru Sakura had been one of the victims.

Though she only remembered the incident much later.

Interestingly, however, in the Fifth Holy Grail War of her original world, Rider Medusa had been summoned by Sakura Matou.