Amazon Japan, as well as various bookstores, have listed three OVA episodes of the Shingeki no Kyojin: Lost Girls spin-off novel on their website, revealing that the series will receive an anime adaptation. The first episode will be bundled in the 24th volume of the Shingeki no Kyojin manga series, to be released on December 8, 2017, while the remaining two episodes will each be bundled in the 25th and 26th volumes, released on April 9 and August 9 of next year, respectively. It was also revealed that Wit Studio will be producing the OVA series.

Shingeki no Kyojin: Lost Girls is a spin-off novel written by Hiroshi Seko and consists of three stories about Mikasa and Annie. The series compiles the visual novels Mikasa Gaiden: Lost in the Cruel World and Annie Gaiden: Wall Sina, Goodbye, with the former being bundled in the third Blu-ray volume of the Shingeki no Kyojin anime adaptation and the latter bundled in the sixth volume. The novel was published in Japan on December 9, 2014. A two-volume manga adaptation under the same title, drawn by Ryousuke Fuji, was serialized in Kodansha's Bessatsu Shounen Magazine between August 2015 to May 2016.

Vertical Inc. licensed the novel for North American release on June 28, 2016, while Kodansha Comics USA published the manga series from August 2016 to February 2017, both under the English title Attack on Titan: Lost Girls.

Source: Ota☆Suke

Shingeki no Kyojin: Lost Girls on MAL