The Door of Hope

Kibō no Tobira (希望の扉)

Reclining on his bed, Reiner thinks about his past and a conversation he had with his mother on the curse of being an Eldian. He and his mother were abandoned by his Marleyan father, leading to the beginning of his quest to become an honorary Marleyan. He entered the military training program where selected trainees were chosen to become Titans; Annie Leonhart as the Female, Marcel Galliard as the Jaw, Zeke Jaeger as the Beast, Pieck Finger as the Cart and Bertolt Hoover as the Colossus. 

Porco Galliard was devastated when Reiner was chosen to be the Armored Titan, but Marcel had sabotaged Porco's chances for selection to spare his brother from the dangers of battle. General Magath sent Annie, Bertolt, Reiner, and Marcel on a mission to reclaim the Founding Titan on Paradis, but on arrival, Ymir, in the form of a Pure Titan, emerged from the ground and devoured Marcel. Annie and Bertolt wanted to abort the mission, but Reiner convinced them to proceed, leading to the breaching of Wall Maria. 

Following the mission, they reverted to their human forms and joined the Training Corps on Paradis. Emerging from recollections of his past, Reiner contemplates suicide, but reconsiders because of his role as a mentor to Falco and the other warrior cadets. Meanwhile, Falco engages in conversation with a wounded Eldian soldier who has lost a leg and an eye, but admits to faking trauma-induced amnesia to avoid being sent back home.