Mary Stuart/Tudor is the love interest of Tenzo Crossunite in the anime series Horizon in the Middle of Nowhere. She is the twin sister of Queen Elizabeth and a student of Oxford Academy who has been assigned to be executed for her role as Mary Stuart, who was historically responsible for assassination attempts against Queen Elizabeth, and Mary Tudor, whose death would trigger the Anglo-Spanish War. After inadvertently revealing her identity to Tenzo and falling in love with him, she returns to the London Tower determined to fulfill her role until she is rescued by Tenzo, who declares his love for her and convinces her to live with him at the Musashi.