Adapted from Ryou Suzukaze's light novel series, this story unfolds in a world where humanity resides safely within colossal walls to shield themselves from the towering Titans. A Titan-worshipping sect's reckless act leads to chaos as a Titan emerges, devouring the cult followers. In the aftermath, two members of the Survey Corps stumble upon a grim sight—a pregnant woman's remains with her unborn child miraculously alive inside the Titan's stomach. As questions arise about the future of this 'Titan child,' humanity grapples with adapting to the ongoing Titan menace.