Ryo Suzukaze Attack on Titan: Kuklo Unbound (Light Novel)* Attack On Titan

In this post-apocalytpic sci-fi story, humanity has been devastated by the bizarre, giant humanoids known as the Titans. Little is known about where they came from or why they are bent on consuming mankind. To combat these monsters, mankind has developed a new set of tools to grant them the skills of flight, speed and agility. Before the Fall details the development of those tools.