In the year 850, the Recon Corps go on a mission, with Hange deciding to pursue a Titan spotted in the forest in the hopes she can capture it. Curiously, as Hange gets the Titan to chase after her, it suddenly retreats to the forest. Hange follows it, where she finds it banging its head against a certain tree. The Titan turns hostile when Hange gets close to it, but Levi and the others arrive and kill it, much to Hange's dismay. Upon inspecting the scene, they discover the decapitated body of Ilse Langnar, a soldier from the 34th Recon Corps division, resting inside of the tree, and finding her notebook lying on the ground. The notebook details Ilse's records, as she escaped on foot after her squad was killed. She eventually became cornered by a Titan, but instead of killing her right away, it started to speak to her in the human language, calling her "Ymir".