- Die for Our Ship: There are those who don't exactly care for the Shido-Riho pairing.
- Evil Is Sexy: In episode 12, after Riho leaves Shido, she starts dressing in a slinky black mini-dress.
- Fan-Preferred Couple: Apparently, there are those who would ship Shido with either Yayoi or Cain.
- Freud Was Right: When Cain forcibly feeds Shido blood in a flashback in episode 12, it looks a lot like a rape in progress . . .
- Magnificent Bastard: Cain, once you realize that by having Shido and Riho in a happy relationship together as vampires, it makes it more likely fo Cain to inlfuence Shido in a century or two.
- Moral Event Horizon: In Episode 12, after Riho kills Yayoi and Guni, Shido feels he has no alternative but to kill her.
- Otaku O'Clock: "Nightwalker" was one of the first late-night anime series.