Attack on Titan: Hangeki No Noroshi (Novel)

Attack on Titan: Hangeki No Noroshi (小説　進撃の巨人　反撃の狼煙) is a novelization written by Shuka Matsuda of the web drama prequel to the live-action movies.

Plot
A novelization of Attack on Titan: Hangeki No Noroshi, the spin-off of the live-action movies. In Hans' chapter, Izuru takes a peek into the secret of Hans' research on Titans. Sasha's chapter will reveal her unknown, gloomy side. In Fukushi and Lil's chapter, their feelings clash and result in a fierce battle. What are the "three keys" to the destruction of Titans that were not featured in the movies?