21 books • 1 series
Book #1: How NOT to Summon a Demon Lord Vol. 1
Book #2: How NOT to Summon a Demon Lord (Manga) Vol. 2
Book #3: How NOT to Summon a Demon Lord (Manga) Vol. 3
Book #5: How NOT to Summon a Demon Lord (Manga) Vol. 5
Book #6: How NOT to Summon a Demon Lord (Manga) Vol. 6