Attack on Titan: Counter Rockets (2015)
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During the Great Titan War, a race of giants called Titans nearly wiped out humanity. The survivors built three concentric walls tall enough to keep the Titans out, but a century into that era of peace, the Colossal Titan suddenly appeared and kicked a hole through the Outer Wall, allowing other Titans to surge through. Forced to retreat behind the Middle Wall, humanity begins planning its retaliation.