The first Shingeki no Kyojin OVA, Ilse no Techou, is adapted from a side-story in the 5th volume of the Shingeki no Kyojin manga. The second, Totsuzen no Raihousha, is an original story that utilizes the comedic previews found at the end of the manga's volumes. The third is an anime-original story.
Ilse no Techou was scheduled to be bundled with the 11th limited-edition manga volume on August 9, but the disc was delayed 4 months. The 11th special-edition manga volume bundled a sticker and 3D card instead of the OVA.