Before the fall, and before the trials of “the Titan’s son” Kuklo, a young smith by the name of Angel Aaltonen grappled with the giants as only a craftsman could … This story predates where the Attack on Titan: Before the Fall manga series begins.
 
1) Anheru works at a workshop creating protective gear/weapons for the scouting legion (the story is set before the 3D maneuver gear was invented). Anheru is a first class weapons craftsman, and therefore has direct access and also is involved in the ongoings within the scouting legion. In the story, people still didn't know about the weak points of the titans; the story is about Anheru beginning to work on the ultimate weapon/gear to fight the titans. So essentially we learn about how the 3D maneuver gear came about. 
2) A baby is found crying in a mass of Titan vomit, amidst the dead titan flames. The child is called "child of titan" and is essentially hated by the people inside the walls. He also seems to grow unnaturally fast. Named Kyukuro, he parts himself from his past/upbringing and gambles on the fate of humanity by enlisting in the scouting legion. 
3) Kyukuro has survived from the outside wall: in order to defeat the titans, he gets his hands on the 3D manuever gear. Although the gear is still imperfect and causes a troublesome incident for Kyukuro, he fights the titans. Whether it is because it is his fate to fight them, or it is because of his past, he fights against them. 
(Source: Kodansha Comics & Mangahelpers)

Adaption of Ryou Suzukaze's light novel series of the same name. 
Humanity has learned to live in complacency behind its high walls, protected from the giant Titans. But when a Titan-worshipping cult opens one of the gates, a Titan wreaks havoc, consuming the cultists. After the rampage is over, two young Survey Corps members are shocked to discover a pregnant woman’s partially digested corpse—with her baby still alive inside it! What will the fate of this “child of the Titans” be? And how will humanity learn to cope with the Titan threat?
 
(Source: Kodansha USA)

In this post-apocalyptic sci-fi story, humanity has been devastated by the bizarre, giant humanoids known as the Titans. Little is known about where they came from or why they are bent on consuming mankind. Seemingly unintelligent, they have roamed the world for years, killing everyone they see. For the past century, what's left of man has hidden in a giant, three-walled city. People believe their 50-meter-high walls will protect them from the Titans, but the sudden appearance of an immense Titan is about to change everything.
 
(Source: Kodansha USA)
 
Note: Includes 2 extra chapters.

A 12-page pilot chapter to the side story Before the Fall. Some events differ from the original side story.

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