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Nagi Kirima, voiced by Miyuki Sawashiro, is a prominent character in the anime series "Boogiepop Phantom." She is a mysterious and enigmatic figure who possesses extraordinary abilities and serves as a guide to the protagonist, Boogiepop. Nagi's role in the series is pivotal as she provides insights into the supernatural events unfolding and helps Boogiepop navigate the complex world of the supernatural.