The story takes place inside the human body, where trillions of anthropomorphic cells each do their job to keep the body healthy. The series largely focuses on two such cells; a rookie red blood cell, AE3803, who often gets lost during deliveries, and a relentless white blood cell, U-1146, who fights against any germs that invade the body.
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Memories of the Future in Attack on Titan Two Brothers in Attack on Titan Sneak Attack in Attack on Titan Judgment in Attack on Titan 
