| This article is incomplete.|
Please feel free to edit this article to add missing information and complete it.
Specifically, it needs kanji, romaji.
Levi's Unknown Melody?! is an extra chapter included in the Complete Color Edition of the Attack on Titan: No Regrets manga, written by Gun Snark and illustrated by Hikaru Suruga.
In the present, Flagon shows his squad the new formation for expeditions outside the Walls. This bothers Isabel, who feels sleepy and hungry, and Levi and Furlan notice it. Remembering the old man, Isabel begins to sing loudly, much to her squad's annoyance. Levi tells Flagon to get Isabel something to eat in order to silence her.
In the Underground City, a man talks to the beggar about Isabel. He complains about her terrible singing skills but adds he somehow misses her, which makes the old man smile.