Attack On Titan: Before The Fall 17

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, havoc ensues.

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The expedition to test out the Vertical Maneuvering Equipment and keep the Survey Corps alive is plagued by rain and poor conditions- nerves are tense when emergency flares are shot off, and supply wagons turn up destroyed. On top of that, one of the nearby Titans is none other than Ogre, the one who killed Kuklo's mother on the fateful day of his birth! Can he avenge her memory, save the Survey Corps, and convince Xavi that the Titans can be overcome?