15 books in series

進撃の巨人 Before the Fall [Shingeki no Kyojin: Before the Fall] - Manga

進撃の巨人 Before the Fall [Shingeki no Kyojin: Before the Fall] - Manga is a 15-book series with 15 released primary works first released in 2013 with contributions by Ryō Suzukaze, Satoshi Shiki, 諫山創, and 涼風涼.

進撃の巨人 Before the Fall 3
Attack on Titan: Before the Fall, Vol. 4
Attack on Titan: Before the Fall, Vol. 5
進撃の巨人 Before the Fall 6
Attack on Titan: Before the Fall, Vol. 7
進撃の巨人 Before the Fall 8
Attack on Titan: Before the Fall, Vol. 9
進撃の巨人 Before the Fall 10
進撃の巨人 Before the Fall 11
進撃の巨人 Before the Fall 12
進撃の巨人 Before the Fall 13
進撃の巨人 Before the Fall 14
進撃の巨人 Before the Fall 15
進撃の巨人 Before the Fall 16
進撃の巨人 Before the Fall 17