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Levi, Furlan and Isabel have joined the Survey Corps and are put under the command of Squad Leader Flagon, much to the latter's displeasure. As the Survey Corps begin preparations for the 23rd Expedition beyond the Walls, the former thugs plan to kill Erwin Smith and steal some documents during the expedition, as this was the job they were assigned to. Levi worries for his friends' safety, but they convince him to trust them and they join the expedition. The trio demonstrate their abilities in 3D Maneuver Gear and quickly kill some Titans. That day, the Survey Corps are caught in a heavy rain, and Levi takes advantage of this and leaves his friends to try to murder Erwin on his own. However, the soldiers are attacked by a Deviant Type Titan which kills Furlan and Isabel. After Levi kills the Titan, Erwin reveals he knew all along of the true intentions of the trio, and encourages Levi not to regret his decisions. Levi decides to stay in the Survey Corps and follow Erwin's orders.