|Index: "What is this? Agathions?"|
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Chapter 86 of the Toaru Majutsu no Index manga, marks the start of the La Regina del Mare Adriatico Arc also known as The Queen of the Adriatic Sea Arc.
- The Daihaseisai concludes.
- Touma goes to a trip to Northern Italy after winning a contest, and later meets Orsola Aquinas again in Venice.
- Kamijou Touma
- Himegami Aisa
- Fukiyose Seiri
- Misaka Mikoto
- Shirai Kuroko
- Index Librorum Prohibitorum
- Orsola Aquinas
- Agnese Sanctis
- In Touma's flashback sequence mentioning the events that happened in Daihaseisai, it shows him wearing a jacket that looks exactly like the one he wears on the second day of the Daihaseisai as shown in the Toaru Kagaku no Railgun manga. Indeed, it is a reference to the climactic event of the arc where he is forced to fight a transformed Misaka Mikoto.