A boy swallows a cursed talisman - the finger of a demon - and becomes cursed himself. He enters a shaman's school to be able to locate the demon's other body parts and thus exorcise himself.
A family is attacked by demons and only two members survive - Tanjiro and his sister Nezuko, who is turning into a demon slowly. Tanjiro sets out to become a demon slayer to avenge his family and cure his sister.
After his hometown is destroyed and is traumatized, young Eren Jaeger vows to cleanse the earth of the giant humanoid Titans that have brought humanity to the brink of extinction.