Rei Kuroki is a mysterious and complex character from the anime series "Vividred Operation." She is a transfer student who initially appears aloof and distant, concealing her true intentions. Rei plays a crucial role as an antagonist, driven by a tragic past and a promise to restore her world. Her character is defined by her internal struggle between her mission and the friendships she forms with the main characters. As the story unfolds, Rei's motives become clearer, revealing her depth and vulnerability.