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Attack on Titan (literally translated as "Advancing Giants") is a Japanese manga series, and now an anime, originally written and illustrated by Hajime Isayama. The story centers around the lives of Eren Yeager, his adoptive sister Mikasa Ackerman, and their friend Armin Arlert, who live in a world where the remnants of the human population live inside cities surrounded by enormous walls due to the sudden appearance of the Titans, gigantic humanoid creatures who devour humans seemingly without reason.

In a world where having superpowers is the norm, heroes fight day and night against the villains who terrorize the populace in order to keep peace and order in the society. The story follows a seemingly bland but extremely powerful individual named Saitama, who initially fights as a hero for fun.

After the second impact, all that remains of Japan is Tokyo-3, a city that's being attacked by giant creatures that seek to eradicate the human kind, called Angels. After not seeing his father for more than eight years, Shinji Ikari receives a phone call, in which he is told to urgently come to the NERV Headquarters, an organization that deals with the destruction of the Angels through the use of giant mechs called Evas.