Among the Commons: An Attack on Titan Story

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.