Original Text on Ao3. 

The plan to capture Annie begins. Himmel smuggles Eren, Armin, and Mikasa through the Undercity and into Mitras, where they find Annie. Where do her loyalties lie? Spoiler: the plan doesn't go well.

Original Text on Ao3. 

Erwin hatches a plan to catch the Female Titan. Himmel is to leave with Eren, Mikasa, and Armin at sunrise. Before that, though, Levi and Himmel work up the courage to do what they've never allowed themselves to do before.

...You better wear headphones for this.

Original text on Ao3. 

Levi, Eren, and Himmel return to the Special Operations Base. Levi and Eren both have some emotional unpacking to do, Himmel experiences something for the first time in her life, and Levi regales Eren with a tale from his and Himmel's childhood.

Original Text on Ao3.

The attempt to capture the Female Titan doesn't go as expected, and hard decisions are made. 

Original Text on Ao3. 

Plans are made to capture the Female in the Titan Forest. Realizing that she is in more danger than ever before, the night before the mission, Himmel reveals her secret to Levi after hiding it for their entire lives. Levi's reaction isn't what she thought it would be.

Original Text on Ao3. 

Hange arrives to perform tests on Eren. The team is alarmed not only by Eren's partial transformation while picking up a spoon, but also by how Himmel handles the situation. As their world grows more unsettling, Levi makes a discovery about Himmel's secrets. 

Original Text on Ao3.

Himmel settles in with the Special Operations Team, and after managing to con Levi into showing the team some of the street acts they did for money as kids, they wind up in his bedroom, where Levi issues Himmel a warning.

Original Text on Ao3. 

Himmel is officially a member of Team Levi, entrusted with the task of guarding Eren. Levi wastes no time in making it clear to Himmel who's in charge, and that he is intent on finding out her secrets. 

Original Text on Ao3. 

Himmel and Levi are finally reunited, but he isn't as happy to see her as she would have hoped.

Jean accompanies Himmel down to Undercity Trost to help with the cleanup, and learns about the unforgiving world under his feet.

Original Text on Ao3. 

The Colossal shatters through Trost while Himmel and the rest of the 104th are on duty there. Himmel charges to the hole in Wall Trost in an attempt to stem the flow of Titans, and when she reaches the point of collapse, does something... counterintuitive. 

Will Levi and the Survey Corps arrive to find her among the dead?