The sudden appearance of the Titans led the Men to erect solid walls behind which they were escaping to escape the extermination. Thirty years after the construction of these walls, a monster manages to penetrate the Shiganshina district where he commits a massacre. In the rejections he leaves from his feast is found a pregnant woman... and against all expectations, his baby survived... A dazzling prequelle that will lift the veil on the origins of the three-dimensional maneuvering device, seventy years before the events related in the main series!