Original Text on Ao3. 

Himmel continues doing supply runs all winter, and the closer to spring they get, the more active the Titans are. After losing men on multiple missions in late winter, she faces her most harrowing encounter yet. Will Levi's letters alone bring her courage enough to survive?

Original text on Ao3.

After the success of her first mission, Himmel is sent on one supply run after another. For some reason, she keeps writing letters to Levi. And for some reason, he keeps replying.

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On a supply run in Titan territory, Himmel and the gang encounter a 15-meter and must think fast. Levi has some things to say regarding Himmel's methods. 

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It's the third and final year of the Cadet Corps. What was supposed to be a standard mock supply run has turned into a real one. Himmel must lead Eren, Mikasa, Armin, and Connie through Titan infested Wall Rose to reach Nedley, the only Wall Rose city still inhabited.

The team encounters their first Titan, and attempts to survive.

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Himmel says farewell to the Undercity and hello to the 104th. It's quite the adjustment.

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Two years after Wall Maria has fallen, Erwin asks Levi if he knows anyone in the Undercity that can help replenish the ranks. Against his will, he is forced to introduce Himmel Zweite to Erwin. It has been twelve years since he last saw her, and in that time she has come to control all organized crime in the Undercity in an attempt to bring food, health, and safety to its withering people.

Erwin gives her the choice to join the Survey Corps, reclaim Wall Maria and the land beyond, and get all of her people out of the Undercity.

Will Himmel take Erwin up on his offer? Will she agree to work with Levi again after parting on such bad terms a decade ago?