Queen's Fleet, Part 4 (女王艦隊④ Joō Kantai ④?) is the 91st chapter of the Toaru Majutsu no Index manga was released on March 12, 2015.
- The Amakusa Christians, Kamijou Touma, Index, Lucia, and Angelene, gather around dinner to discuss what to do with the problem with Agnese Forces and the La Regina del Mare Adriatico. They later go to battle against the Queen's Fleet to stop Biagio Busoni's plans and save Agnese Sanctis and the other members of the Angese Forces.
- Kamijou Touma
- Index Librorum Prohibitorum
- Orsola Aquinas
- Tatemiya Saiji
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