Launched in 2009, the Attack on Titan manga currently has 25 million copies sold . The story received an anime adaptation with 25 episodes that was released this year in April.
The original story revolves around young Eren Yeager, his adopted sister Mikasa Ackerman, and their friend Armin Arlert, who live in a world where the remnants of the human population live within cities surrounded by huge walls due to the appearance of the Titans, humanoid creatures. giants that devour humans seemingly for no reason.
Via: Jefusion