Attack on Titan is based on a manga series written and illustrated by Hajime Isayama.

The series is set in an alternative middle-ages world that has been attacked by giant humanoid creatures called Titans. The remains of civilization is protected by three concentric walls that are about fifty meters tall. After building these walls, humanity has remained safe for 100 years and has basically become complacent. While there are people who want to go outside of the walls and explore the wall, many are discouraged from doing so.

The main character of the series is Eren Jeager. He is one who wants to explore the outside world, but his parents and his adopted sister Mikasa are very much against this idea. His father is a doctor, and during the first episode, he leaves to treat patients located elsewhere.

After he leaves, the unthinkable happens. Unusual Titans break through the wall: one is 60 meters tall, while the other has a hardened shell. The city is plunged into chaos, and Eren discovers that his mother is trapped in the rubble of their house. Eren tries to save his mother, but his mother insists that he run to safety and to leave her behind. A guard named Hannes grabs both Eren and Mikasa and carries them off in safety. At the end of the first episode, Eren sees his mother being eaten by one of the Titans.

By the time I finished watching the first episode, the tone of the storytelling changed from an establishing to series to an intense viewing experience once the Titans broke through the wall. I liked how the first episode ultimately is told in a circle: the major plot point of the Titans is shown at the beginning, and then the rest of the episode establishes what's going on and returns to what was shown at the beginning of the episode. Even with using this storytelling device, the viewer is so riveted by the end of the first episode that they want to see the next episode to see what will happen to Eren and to find out what happens next in the story.

I thought the animation for Attack on Titan looked incredible. While this series utilizes both 2D animation and computer graphics, the 2D animation was designed and drawn in such a way that it blends in more convincingly with the computer graphics than many other anime series that I have seen that have tried to combine the two styles. Also, the backgrounds are lush and really complement the rest of the animation.

At the end of the first episode, there is some blood shown when Eren's mother is being eaten by the Titan. Outside of that, though, I didn't see anything too terribly objectionable in the visuals. Personally, I would recommend Attack on Titan to anime viewers who are 13 or 14 years of age and older.

Title	Episodes	Release Year(s)	Director	Studio	N.A. Licensor
Attack on Titan	25	2013	Tetsuro Araki	Wit Studio/Production I.G	FUNimation Entertainment