23 books • 2 series
Book #8: Marginal Operation: Volume 8
Book #9: Marginal Operation: Volume 9
Book #11: Marginal Operation: Volume 11
Book #14: Marginal Operation: Volume 14
Book #3: Seirei Gensouki: Spirit Chronicles (Manga): Volume 3
Book #4: Seirei Gensouki: Spirit Chronicles (Manga): Volume 4