Set in an alternate retelling of the Shiganshina District fall, the player assumes the role of an original character (customizable name) who joins the Survey Corps. Unlike Eren or Mikasa, your protagonist is not a prodigy. Your primary weapons are not swords, but wit, charisma, and emotional intelligence. The title "Mate" is a double entendre: it refers to camaraderie (battle buddies) and the potential for romantic pairings within the ranks.