13 books • 3 series
Book #6: Attack On Titan: Before The Fall 6
Book #7: Attack On Titan: Before The Fall 7
Book #9: Attack On Titan: Before The Fall 9
Book #10: Attack On Titan: Before The Fall 10
Book #11: Attack On Titan: Before The Fall 11
Book #2: Kami-Kaze
Book #5: Kami-Kaze Volume 5
Book #5: The Legend of Dororo and Hyakkimaru Vol. 5
Book #6: The Legend of Dororo and Hyakkimaru Vol. 6