Titans are on the verge of destroying humanity, and it's up to the Scout Regiment to survey beyond the walls and destroy the entire Titan population. Everyone knows this story-how Eren's motive to eliminate all Titans transforms into a bloodthirsty desire to destroy the world. But what many don't know is that the nine transforming Titans aren't the only ones. There's another-an artificial transforming Titan-a science experiment gone wrong, and it is called the Demon Titan. This Titan is wielded by a man known as Axel Strucker, a member of the transforming Titans from the mainland who's sole purpose is to retrieve Eren Jaegar. Struckers' plans are interrupted; however, by the presence of the Scout Regiment's most powerful female soldier-a young girl by the name of Lorelei Klein-an Ackerman though unaware of such a secret... Axel and Lorelei must journey through the course of war, death, and betrayals as they must do whatever it takes to survive the ultimate snap of Eren Jaegar.