During their winter training in the mountains as cadets, Krista and Ymir become lost while saving fellow cadet Daz during a blizzard. Ymir accuses of Krista of having a death wish rather than saving Daz for selfless reasons. She also reveals she knows that Krista is an unwanted illegitimate child of a nobleman's mistress who was forced by the Wall Cult to change her name and join the army. Telling Krista that they were both given a second chance in life, Ymir makes Krista promise that should she ever reveal her true name, she should live her own life. Back in the present, Titan Ymir fights off the other Titans as Reiner and Bertholdt recognize Ymir as the Titan who ate their childhood friend in the past. Realizing Ymir is trying to help them, Krista tells Ymir to destroy the tower instead in order to crush the Titans. As the tower begins to collapse, Ymir orders Krista and the others to grab on to her. Despite this effort, the Titans overwhelm Ymir; only the timely arrival of Hange and the other Scouts saves them. With the battle over, Krista attends a gravely injured Ymir as the rest of the 104th Trainees learn Ymir is a Titan Shifter. Just before Ymir loses consciousness, Krista reveals that her real name is Historia.