Attack On Titan: Before The Fall 5

Saved from exile, Kuklo and Cardina meet the hero Jorge Pikale, the first man ever to defeat a Titan in combat, and they learn how he did it: a mysterious gaspowered grappling machine known only as "the device." Jorge believes Kuklo might just have the agility and reflexes to master this startling weapon and take the Survey Corps to a new level. But Kuklo has his doubts, and what will Sharle think…?

Volume 5 of the Attack on Titan: Before the Fall manga series by Hajime Isayama.