Airplane

Hikōki (ひこうき) is the 3rd chapter of the 2nd volume and the 8th chapter overall of the Attack on Titan: Lost Girls manga, written and illustrated by Ryōsuke Fuji.

Overview
While Eren recovers at home, Dr. Yeager takes Mikasa back to her home. On the boat, he tells her that his friend in the Garrison will look into the incident. He expresses worry for his son and believes Mikasa may be able to change Eren's mind. During later visits to the Ackerman family home, Eren is absent due to his injuries. Mikasa writes a letter to Eren and gives it to his father so he can receive it.

When winter comes, Dr. Yeager reveals that Mikasa's mother has pregnancy toxemia and must move to Shiganshina so that immediate care can be given. Mikasa wants to see Eren again, but his mother says he is busy with Armin. Dr. Yeager receives information from his friend Hannes about Eren's attackers. He sits with Mikasa and reveals that the two men who attacked Eren were killed in a carriage accident. He says the men got what they deserved, and later Mikasa sees images of her parents being attacked in her mind.

Eren reunites with Mikasa, having recovered from his injuries. He tells her that the Survey Corps has been disbanded and the gates to the Walls have been sealed, and that he and Armin plan to fly over the Walls in an airplane left by Armin's parents. Mikasa worries for Eren's safety, but promises to keep his plan a secret. Before he leaves to fly with Armin, Eren gives Mikasa his scarf and a caged butterfly, and Mikasa asks him not to die.