13 books • 3 series
Book #4: Nightmare Inspector: Yumekui Kenbun, Vol. 4
Book #5: Nightmare Inspector: Yumekui Kenbun, Vol. 5
Book #6: Nightmare Inspector: Yumekui Kenbun, Vol. 6
Book #7: Nightmare Inspector: Yumekui Kenbun, Vol. 7
Book #8: Nightmare Inspector: Yumekui Kenbun, Vol. 8
Book #9: Nightmare Inspector: Yumekui Kenbun, Vol. 9
