This volume 2 covers chapters 5 – 9  in the manga.
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Synopsis:
BIRTH OF A MONSTER

The Colossal Titan has breached humanity’s first line of defense, Wall Maria. Mikasa, the 104th Training Corps’ ace and Eren’s best friend, may be the only one capable of defeating them, but beneath her calm exterior lurks a dark past. When all looks lost, a new Titan appears and begins to slaughter its fellow Titans. Could this new monster be a blessing in disguise, or is the truth something much more sinister?

This volume of Attack on Titan includes special extras after the story!
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Number of pages: 192
Release date: September 2012
Age rating: 14+
Number of volumes: 34 (completed)