The sister of Kazuya. She resides in Japan

Kazuya Kujou is a foreign student at Saint Marguerite Academy, a luxurious boarding school in the Southern European country of Sauville. Originally from Japan, his jet-black hair and dark brown eyes cause his peers to shun him and give him the nickname "Black Reaper," based on a popular urban legend about the traveler who brings death in the spring.
 
On a day like any other, Kujou visits the school's extravagant library in search of ghost stories. However, his focus soon changes as he becomes curious about a golden strand of hair on the stairs. The steps lead him to a large garden and a beautiful doll-like girl known as Victorique de Blois, whose complex and imaginative foresight allows her to predict their futures, now intertwined.
 
With more mysteries quickly developing—including the appearance of a ghost ship and an alchemist with the power of transmutation—Victorique and Kujou, bound by fate and their unique skills, have no choice but to rely on each other. 
(Source: MAL Rewrite)

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Megan Shipman is an American voice actress.

The year is 1924, the place, Sauville, a small European country neatly tucked beside the Alps... 
Kazuya Kujo has been studying abroad at the prestigious Saint Marguerite Academy, where urban legends and horror stories are all the rage. Most Kazuya ignores -- but the story of the "Queen Berry", a mysterious ghost ship, really gets to him. Of course, his brainy friend Victorique is much more intrigued by true stories, and she uses her unrivaled logic to solve mysteries even the town's famous detective can't. Ironically, it's Victorique's inquisitive nature that leads the duo to board a ship that matches the "Queen Berry"'s description to a tee, a ship that might just hold the key to solving a sinister mystery... 
Kazuki Sakuraba's modern twist on Holmes and Watson-- pairing Victorique, a brittle young girl with doll-like looks with her eager-to-please sidekick Kazuya-- make this international bestseller a must-read murder mystery. 
(Source: Tokyopop)

Kujo Kazuya is studying abroad in Sovuria (a fictional country in Europe), where he meets the mysterious Victoria. Possessing a brilliant mind, which she calls "fountain of wisdom", she seems to know everything, although she never attends classes and is restricted to her room and the schools library. 
 
(Source: taken from the light novel summary) 
 
Note: Volume 2 contains the extra "Suigyo no Majiwari" (水魚の交わり).

Ruri Kujou