Attack on Titan: No Regrets

Shingeki no Kyojin Rivai Gaiden: Kui Naki Sentaku (進撃の巨人リヴァイ外伝「悔いなき選択」) is an ongoing spinoff manga illustrated by Hikaru Suruga and written by Gan Sunaaku with a story based on the A Choice With No Regrets visual novel. This manga focuses on Levi, and the events happening in it are prequel to the main story by Hajime Isayama. There's currently one single prologue chapter published, with the first chapter coming in the next issue of Aria.

Kodansha USA announced that they will be releasing this manga starting on August, 2014.

Reception
Aria magazine announced on the official website for Kodansha that it will be reprinting the prologue chapter of Shingeki no Kyojin Gaiden: Kuinaki Sentaku manga in the December issue on October 28, after the November issue sold out due to the extreme demand for the prologue chapter.