4 books • 1 series
Ninja Slayer Kills 5 (Ninja Slayer Kills, #5)
Ninja Slayer Kills 4 (Ninja Slayer Kills, #4)
Ninja Slayer Kills Vol. 3 (Ninja Slayer Kills)
Ninja Slayer Kills Vol. 2 (Ninja Slayer Kills, #1)