A three-part OVA adapting the "Shingeki no Kyojin: Lost Girls" spinoff novel that will be bundled with the 24th, 25th and 26th limited edition volumes of the manga. 
 
Wall Sina, Goodbye: 
Annie Leonhart has a job to do—and a resulting absence that must stay off her record at all costs. With no one else to turn to, she asks her comrade Hitch Dreyse to cover for her. She agrees but puts forward a single condition: Annie must solve the fruitless missing person case Hitch was assigned. The case revolves around Carly Stratmann, a university graduate and the daughter of wealthy businessman Elliot Stratmann. With only a single day to solve the case and the underground of the Stohess District crawling with thugs, Annie must put her all into finding this girl. Yet, every answer she uncovers only leads to further questions—how has the illegal drug coderoin found its way to Stohess, what is Elliot hiding, and where has Carly disappeared to? 
 
Lost in the Cruel World: 
With worry for Eren Yeager gripping her heart, Mikasa Ackerman begins to remember. She remembers her conversations with Armin Arlert, her concern for her friends, and most painfully, the time she had almost lost everything. As fear takes control, she begins to experience an alternate version of her past—some things can be changed, but are there events so inescapable that she can't even prevent them in her dreams?

Spin-off novel consisting of 3 stories about Mikasa and Annie. 
1. Lost in the Cruel World 
2. Wall Sina, Goodbye 
3. Lost Girls

Several hundred years ago, humans were nearly exterminated by titans. Titans are typically several stories tall, seem to have no intelligence, devour human beings and, worst of all, seem to do it for the pleasure rather than as a food source. A small percentage of humanity survived by walling themselves in a city protected by extremely high walls, even taller than the biggest of titans. 
Flash forward to the present and the city has not seen a titan in over 100 years. Teenage boy Eren and his foster sister Mikasa witness something horrific as the city walls are destroyed by a colossal titan that appears out of thin air. As the smaller titans flood the city, the two kids watch in horror as their mother is eaten alive. Eren vows that he will murder every single titan and take revenge for all of mankind. 
(Source: MangaHelpers)

Eren and his companions in the 104th are assigned to the newly-formed Levi Squad, whose assignment is to keep Eren and Historia safe given Eren's newly-discovered power and Historia's knowledge and pedigree. Levi and Erwin have good reason to be concerned, because the priest of the Church that Hanji had hidden away was found tortured to death, making it clear that the Military Police are involved with the cover-up. Things get more harrowing when the MPs make a move on Erwin and the Levi Squad narrowly avoids capture. Eren is also having problems with his Titan transformation, and a deadly killer has been hired to secure Eren and Historia, one Levi knows all too well from his youth. 
 
(Source: Anime News Network)

That day, Annie Leonhart woke up in the barracks. It was the morning of her day off. The feeling of freedom doesn’t last long, for tomorrow holds her biggest mission yet: During the 57th Expedition Outside the Walls, seize Eren Yaeger.
 
(Source: Kodansha USA)

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