The Toaru Majutsu no Index II Archives 4 (「とある魔術の禁書目録Ⅱ」アーカイブス４ Toaru Majutsu no Index II Archives 4?) is the fourth audio drama/character song set released for the second season of the Toaru Majutsu no Index anime. It was released by Geneon on August 24, 2011 and contains two character songs for Accelerator and Last Order along with an audio drama .