Attack on Titan: No Regrets, translated from Shingeki no Kyojin: Kuinaki Sentaku, is currently running in Aria, a shoujo manga magazine published by Kodansha. We are receiving it in North America through Kodansha USA, and so far have volume 1.
The Gist: Attack on Titan: No Regrets is a prequel of sorts to Isayama’s Shingeki no Kyojin. It tells the meeting of Levi and Erwin, how Levi came to be a top soldier in the Survey Corps, and why Erwin is so cut-throat practical no matter the sacrifice in order to beat the Titans.
This first volume introduces a new “world” behind the walls, an underground inhabited by murderers and criminals that’s tough to survive. This is Levi’s territory. Here, he and his comrades maneuver through the underground with stolen military gear, and it seems they’ve caught the attention of Erwin. When he captures Levi and his comrades, he offers them a choice: you can face military punishment for stealing equipment, or join the scouting regimen. The trio decide to join the military and hatch plans to cause problems. Levi is determined to kill Erwin, and his buddy Farlan has some kind of plan to steal something. When they go on their first journey outside the walls, the members of the Survey Corps witness firsthand why Erwin was determined to recruit Levi.