"Misaka Mikoto" (お姉様 (みさかみこと) Misaka Mikoto?, lit. "Big Sister") is the 10th episode of the Toaru Majutsu no Index anime series and the first episode of the Sisters Arc. It was first broadcasted on December 6, 2008, with the script written by Nishizono Satoru, and the episode storyboarded and directed by Tachibana Hideki.