The Shiganshina District (シガンシナ区 Shiganshina-ku?) is a town located on the south edge of Wall Maria; and is the hometown of Eren Jaeger, Armin Arlelt, and Mikasa Ackermann. The district is built within an outcrop of Wall Maria. Since Shiganshina is located to the south, Titans usually came to this district's Walls in an attempt to consume humans, but were only able to break through in the year 845 because of the 60-meter tall Colossal Titan.
In the year 845, the Colossal Titan breached Wall Maria and the front gate of Shiganshina by kicking a hole through it, allowing Titans to overrun the city. Shortly afterward, the Armored Titan broke down the back gate, fully breaching Wall Maria and forcing humanity to abandon Wall Maria and retreat behind Wall Rose. It is also the first city to be attacked by the Titans after a century of peace.
There is little mention of Shiganshina after the attack. Erwin decides to appear at the recruitment ceremony of the 104th Cadet Corps to persuade them to join the Scout Regiment. Erwin mentions the basement in Eren's house, and how it can hold the answer to the mystery of the Titans. He also explains that to access this basement, they would need to find a way to reclaim Shiganshina and Wall Maria altogether. A month later, Erwin and the Scout Regiment set out on the 57th exterior mission as a practice run to Shiganshina.
Reiner Braun, Bertholdt Hoover, and Ymir rest on top of the Wall in Shiganshina, after escaping the horde of Titans sent to attack them with the Coordinate. Ymir thanks Reiner and Bertholdt for inadvertently rescuing her from her nightmare, by attacking the Walls, and promises to return with them to their Hometown.
When the plans to retake Wall Maria are ready, the Scout Regiment start an expedition towards Shiganshina at night time, when most of the Titans would be inactive. After the soldiers arrive in the district, they begin the operation with 100 soldiers traveling to the exterior gate covered with hoods and cloaks to confuse the enemy so they would not know which soldier is Eren. After making his way to the top of the Wall, Eren freezes when he sees his hometown for the first time in 5 years, but is quickly pushed on by Levi Ackermann and he makes his way to the gate, preparing to transform. Finally, Eren transforms and seals the hole in the outer gate with his hardened Titan body.
However, their seeming success is soon interrupted by the arrival of the Armored Titan and the Colossal Titan, during which the latter kills most of the soldiers inside the district and destroys much of the abandoned city, save for the members of Squad Levi and Hange. During this, the Beast Titan wipes out the soldiers evacuating the Scouts' horses, fatally wounding Erwin Smith in the process. However, a last-ditch assault concocted by the survivors sees the Armored and Colossal Titans successfully incapacitated, with Reiner and Bertholdt captured alive. The Beast Titan is also disarmed by Levi, who wipes out his army of Titans surrounding the district.
The battle sees the near-death of Armin Arlelt, who is administered the Titan injection by Levi and resurrects by gaining the power of the Titans. While Zeke and Reiner are rescued by the Cart Titan, Bertholdt is eaten alive by the transformed Armin, as the remaining Warriors are forced to retreat from Shiganshina.
Nine months later, after all the Titans inside Wall Maria had been killed with the Executioners from Hell, the people of the Walls began to reclaim territory within Wall Maria. They paved their way along a new road toward Shiganshina, where work began to rebuild the district. Not long after, an expedition by the Scout Regiment commences, starting from Shiganshina, to the edge of the land, at the ocean. Only one titan is spotted outside of Wall Maria throughout this expedition.
The Reeves Company is given the responsibility to reconstruct the district by the military. However, in 854, the military forcefully evacuates all the citizens of Shiganshina. This order spreads confusion around the populace.
However, Cadet Corps sessions under Keith Sadies are still being held inside Shiganshina. Following the emergence of the Jaegerists, the group interrupts one exercise in order to seize control of the training regiment. The complex serves as a headquarters for the Jaegerists, as well as a prison for their adversaries. Those held captive in the prison include military branch leaders Dot Pyxis and Nile Dawk, a group of Scout Regiment officers, the Braus family, and two Warrior candidates.
After being infiltrated by Warriors Pieck and Galliard, Shiganshina becomes the scene of battle once more when Pieck leads Eren Jaeger into a trap at the military HQ. Though the Jaw Titan's ambush fails, Marleyan airships holding Theo Magath and the remainder of the Warriors fly into the district's proximity. The ensuing conflict leaves the district in ruins once again.
In the battle's climax, Eren Jaeger undoes the hardening of every Wall on the island, revealing an army of Wall Titans within them. Shiganshina's landscape is drastically altered by this event. After the town is cleared of Pure Titans called within the battle, the Jaegerists reestablish control of the district.