"Virus Code" (最終信号(ウィルスコード) Wirusu Kōdo?, lit. "Last Signal") is the 20th episode of the Toaru Majutsu no Index anime series and the final episode of the Three Stories Arc adapted for the season, ending Accelerator's side of the story. It was first broadcast February 19, 2009, and was directed by Takashima Daisuke, storyboarded by Sugishima Kunihisa, and the script written by Nishizono Satoru. The ending theme, Rimless ~Fuchinashi no Sekai~ is finally replaced by Chikaigoto ~Sukoshi Dake Mou Ichido~.