The younger sister of Remilia Scarlet and one of the most powerful vampires in Gensokyo. Hidden away for centuries within the Scarlet Devil Mansion, Flandre rarely meets outsiders. Despite her innocent smile and playful demeanor, she possesses terrifying abilities capable of destroying almost anything. Curious about the world and eager for entertainment, she welcomes anyone interesting enough to keep her attention.

Sakuya Izayoi is the elegant and mysterious head maid of the Scarlet Devil Mansion. Known for her flawless professionalism, unwavering loyalty, and extraordinary ability to manipulate time, she maintains the mansion with impossible precision. Though calm and composed on the surface, Sakuya possesses a sharp intellect and a subtle sense of humor. Whether serving tea, organizing the estate, or protecting its residents, she performs every task with unmatched grace. Few can tell what lies behind her polite smile, and fewer still have witnessed the true extent of her abilities.