Nagi Arisuin is a student at Hagun Academy and a close friend and roommate of Shizuku Kurogane. Born with a male body, Nagi identifies as female and prefers to be called Alice by those close to her. She carries herself with a feminine demeanor and is fully accepted as a girl by Shizuku, who regards her as a big sister. Nagi’s past is marked by tragedy: she grew up in an orphanage in Eurasia alongside her best friend Yuuri, who was killed when local authorities hired a gang to clean up the streets. This event led Nagi into a life as a professional assassin before she eventually enrolled at Hagun Academy to start anew. As a Blazer, Nagi wields the Device Darkness Hermit, which grants her control over shadows. She can create shadow portals for teleportation, immobilize opponents with her Noble Art Shadow Bind by pinning their shadows, and set up shadow-based traps. Her ability to move quickly and trap enemies makes her a formidable combatant, and she qualified for the Seven Star Sword Art Festival. Nagi’s personality is warm, teasing, and supportive. She often gives advice to Shizuku’s brother Ikki and takes an interest in his growth as a knight. Behind her cheerful exterior lies a calculating and strategic mind, honed by her assassin background. She maintains a careful balance between her dark history and her current life as a student, and her loyalty to her friends becomes a central conflict during the Akatsuki Academy invasion, where she ultimately chooses to protect the bonds she has built at Hagun. Her key relationships include a deep, sisterly bond with Shizuku, a respectful camaraderie with Ikki and Stella, and a role as a mentor figure to younger students. Throughout the story, Nagi’s arc focuses on reconciling her past with her desire for a peaceful, ordinary life, demonstrating that she is not defined by her history but by the choices she makes for her found family.