Shingeki no Kyojin: Kuinaki Sentaku  

Attack on Titan: No Regrets, Shingeki no Kyojin: Birth of Levi, 進撃の巨人 悔いなき選択, Shingeki no Kyojin Gaiden: Kuinaki Sentaku, ผ่าพิภพไททัน ภาค OAD No Regret, 進撃の巨人 外伝 悔いなき選択

In a time before he became known as Captain Levi of the Survey Corps, young Levi struggled to make ends meet in the Underground's garbage dump. As head of his own criminal operation, he relied on fellow criminals like Isabel Magnolia and Farlan Church for support. With little hope for the future, Levi agreed to a deal with anti-expedition faction leader Nicholas Lobov, who promised citizenship aboveground in exchange for assassinating Erwin Smith, a Survey Corps squad leader. As fate would have it, Levi and Erwin crossed paths. Impressed by Levi's agility and skill, Erwin offered him the chance to join the expedition team or face Military Police capture to atone for his crimes. The group then planned their mission to complete the assassination and secure a better future. However, they soon discovered that freedom in the surface world came with its own heavy costs. This story is based on the manga series "Shingeki no Kyojin: Kuinaki Sentaku," which explores the encounter between two of the show's central characters and delves into the events surrounding the 23rd expedition beyond the walls.

Shingeki no Kyojin: Kuinaki Sentaku is based on the visual novel of the same name. The visual novel was bundled with the first press release of the 6th Blu-ray volume of the animes 1st season and was supervised by Shingeki no Kyojin creator Hajime Isayama. It was later adapted into a 2-volume manga series which was serialized in shoujo magazine ARIA and illustrated by Hikaru Suruga.The OVA was released for the Western audience when bundled with Kodansha Comics USAs Attack on Titan Special Edition manga. The first part of the OVA was included with the mangas 18th volume on April 5, 2016 while the second part was included with the 19th volumes release on August 2, 2016.