A mysterious assassin known as the Ghost terrorizes the Underground, effortlessly taking down Military Police and other soldiers before disappearing without a trace. During one of her missions, she is confronted by Levi Ackerman, who has been hunting her. Their first encounter quickly turns into an intense battle as both prove to be nearly equal in ODM skill and combat ability. Neither manages to defeat the other, marking the beginning of a dangerous rivalry that will eventually grow into mutual respect—and eventually something much deeper.