Kuroko Tsumugi, twin sister of the Phantom Six Man of GoM, the 2nd manager of the GoM. Is also the childhood friend of the world's most powerful psychic, Saiki Kusuo. After graduating from Teiko Junior High Tsumugi decides to enroll into P.K. Academy to be with Saiki to get away from the whole GoM fiasco. Let's see where our little shadow's journey would lead her.