Trivia / Ninja Slayer

• What Could Have Been: Episode 25 is devoted to airing clips of various light novel storylines that, because of time and budget constraints, didn't make it into the ONA adaptation.

• No Export for You: You're out of luck if you're a ninja slayer fan that doesn't understand Japanese because only a small part of the series has been translated. While the novel and manga were initially licensed by Tokyo otaku mode and Vertical respectively, both licences have been silently cancelled, leaving the future of the series uncertain for English fans.