Amanojaku is the main ghost in the Gakkou no Kaidan first season.
- Amanojaku is the ghost that has appeared in the most episodes of the entire series
- The only episodes where Amoanajaku does not appear are The Circuit Connects to Hell: Demon of the Underworld,The Corpse That Roams in the Night: Shirotabi and Terror at Bloodstain Lake! The Snow Ghost
- Amanojaku, or Amanjaku (天邪鬼, "heavenly evil spirit") is a demon-like creature in Japanese folklore. It is usually depicted as a kind of small oni, and is thought to be able to provoke a person's darkest desires and thus instigate him into perpetrating wicked deeds.