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The academy madonna, Issei's master, and the woman of his dreams.
Her true identity is that of the next head of the high-ranking (noble) Devil Gremory family, also known as the 'Crimson-Haired Ruin Princess'.
Although she is enrolled as an exchange student, she is actually a powerful influence at the school and is the president of the 《Occult Research Club》 which gathers devils under her command. Her rank is 《King》. She is an unrivaled heroine who sees Issei's hidden abilities and shows favoritism towards him.