La Regina del Mare Adriatico Arc

La Regina del Mare Adriatico Arc or The Queen of the Adriatic Sea Arc is a story arc in Toaru Majutsu no Index. The arc is concerned with Kamijou Touma mysteriously winning a trip to Northern Italy despite his misfortune. Here, he is suddenly caught in another conspiracy by the Roman Catholic Church, this time regarding the mobilization of an ancient weapon against Venice – The Queen of the Adriatic Sea.

This arc would mark the Roman Catholic Church's final time as the antagonists before the intervention of God's Right Seat.

Sounds of war
With the considerable weakening of the Roman Catholic Church after the destruction of their knights and one of their most powerful spells. As well as the embarassing fiascos with the capture and execution of Orsola Aquinas, and the capture of Ridovia Lorenzetti and Oriana Thomson by the Anglican Church after the failed capture of Academy City through the use of the Croce di Pietro. Every event has been beneficial to the science side (and the Anglican Church) and has greatly increased their power.

The Roman Catholic Church under the Pope finally allowed the mobilization of The Queen of the Adriatic Sea under Bishop Biagio Busoni's command, in order for the complete and utter destruction of Academy City and everything connected with it to take place. Although Biagio is concerned by the promptness of the Pope's order to mobilize the weapon, he accepts the order.

As punishment for their failure, the Agnese forces become branded as sinners, and is later forced to work mind numbing labor in the Queen's Fleet as punishment. Agnese Sanctis however, is given special privilage as the former leader of the Agnese Forces to prevent revolt among it's members, as well as a the key to changing the targeting system of the Queen of the Adriatic from Venice to that of Academy City, as she is the only one compatible found at the time even though she is a sinner.

A Trip to Northern Italy
After the events of the Daihasei Festival, Kamijou Touma resume his activities as a competitor in the events, though he is obviously affected by misfortune all throughout the week. However, this changes after Touma wins a lottery where the prize is a 7 days and 5 nights trip for two to Northern Italy. Much to his suspicion, Touma becomes wary of the fortune blessed upon him, however he decides to take the vacation to Northern Italy anyway, with Index, despite the dubious nature of his fortune which supposedly involve the powers of Academy City and the Anglican Church.

Prelude
After a series unfortunate events Touma and Index arrive in Chioggia as it is required for tourists and to meet up with the tour guide, though they are unable to find and the contact the person of interest. They decide to go a hotel in the meantime, however, Touma loses track of Index and becomes lost himself in a foreign land; he even attempts to communicate with a local, though very poorly. Touma is however saved by the arrival of Orsola Aquinas, who has returned to Chioggia from London to finish her move with the help of the Amakusa Catholics since the move to London was rushed, she also informs Touma that Index is in her house at the moment after she found her a moment before meeting with Touma.

Touma and Orsola arrives at her house and reunites with Index who is happily eating without a care in the world, much to Touma's frustration. Touma also meets the Amakusa Catholics who have come to help Orsola with her move, here, he overhears them talking about his exploits with the Agnese forces, as well as his various run-ins with Kanzaki Kaori that he survived. Touma and Index later helps Orsola and the Amakusa with the move after having lunch (with Itsuwa of the Amakusa making advances), and later gets into perverted shenanigans with Orsola and Index, much to Touma's frustration.

The Queen's Fleet
After packing all her things, Touma and Index decide to part ways with Orsola, with her remaining a little bit longer in Chioggia and say her final farewells to her beloved town. Before leaving however, Index suddenly senses a magical spell directed at Orsola by a sniper, and successfully redirects the attack away from Orsola. Now aware of an enemy presence, Touma later saves Orsola from another sniper attack, however, he is later dragged into the canal waters by another assassin shortly afterwards. The assassin that emerged from the waters, tries to attack Orsola but she is saved by Index's timely use of her Spell Intercept, and Touma coming out of the waters to finish the assassin off.

The first ice ship
The assault on them is halted after Touma defeated the assassin as well as Index's Spell Intercept working on the sniper. However because of this the sniper retreats into a large ice ship that has been hiding inside the canal besides Orsola's home. The ship's rises from the canal and destroys the stone path Touma and Orsola are on which places them into the rising ship. With them unable to jump back down as the ship is still rising, Touma and Orsola decide to enter the ice ship instead, here, they take notice of how the ship is made of ice, and how it cannot be dispelled by Touma's right hand.

Index is later left behind, as the ship begins to move through the canal (destroying the Ponte Vigo in the process) and into the Adriatic Sea. All the while, the ship's guards are searching for Touma and Orsola knowing that they are on the ship, they are later forced to hide within the ship to escape their pursuers. Already out at sea, Orsola and Touma try to assess the situation, here they determine that their attackers are from the Roman Catholic Church, and they were attacked because of the incident with the Book of the Law (even though that was already supposed to be settled by the Anglican Church), however, they are in disbelief that the Church would go so far to build a ship just they could attack them. However, both of them are later shaken by the realization that there are more than one ice ship and that they are all part of one massive fleet.

Reunion with Agnese Sanctis
After trying to make contact with Index, someone from the ice ship suddenly comes into the room where Touma and Orsola were hiding. Much to their surprise it is Agnese Sanctis, and after a few attacks on Touma (and after Orsola's insistence)decides to update them on the current situation. Here, Agnese explains to them that there are one of the ships of the Queen's Fleet, a convoy of ships for the the Queen of the Adriatic Sea. She hypothesizes that the Catholics attacked them because they were enemies of the Church who were coincidentally at the right place and at the right time at one the Church's major operations, deeming them to be a threat to the operation. Agnese continues by explaining the reason why they were caught since the Queen's Fleet is primarily used for surveillance and just managed to pick them up, she however, states that the Queen's Fleet is a labor facility for sinners such as her and her former squad members.

Agnese then gives them a proposal in exchange for her letting them go, she asks them to save Lucia and Angelene, as they will be punished severly for ecaping the Queen's Fleet (and most likely try to save Agnese and the others). Agnese states that they know how to escape, and assures them that even if the Church detects their escape they will be too busy to concern themselves with a few escape prisoners; Agnese also adds that she'll go to the flagship to create a distraction while they rescue them. Touma asks if she wants to escape as well, though she says that she has to stay as it is her purpose to prevent a riot from occurring. Without other options open, Touma and Orsola accepts Agnese's proposal to rescue Lucia and Angelene and to escape the Queen's Fleet.

Rescuing Lucia and Angelene
After negotiating terms with Agnese, Touma and Orsola go to the room where Lucia and Angelene are being held. Here, they encounter an ice golem guarding the room which Touma easily dispatches it with his right hand; Orsola later picks up the pieces of the destroyed golem and used it to bluff their way out of a battle with Roman Catholic peons, and later detain them. Lucia and Angelene were reluctant however on believing their former enemies, however, Orsola using her experience as an evangelist to pagan countries a convinces them.

With that, Lucia and Angelene show them the method on which how they escape, however, while explaining their method, they are attacked by the power of their Forbidden colored robes. Touma however, offers to use his Imagine Breaker to negate their clothes, though he is forcefully dissuaded by Orsola. The two sister later ask when they could meet up with Agnese, however, Touma apologizes to them, stating that Agnese will not likely be coming along with them as she went to the flagship to distract the Queen's Fleet and allow them to escape. This shocks the both of them, here Lucia state that the true nature of the Queen's Fleet is to protect the Queen of the Adriatic Sea, which is the flagship and a large magic ritual center. Lucia states that they don't know the details but a key to activating it is through a spell known as the Rosary of the Appointed Time, and that Agnese would be used as the necessary sacrifice for it, which would leave her braindead.

Before they could think of a plan however, they are detected by the surrounding ice ships and are attacked by them, eventually destroying the ship they are in.