- For the visual novel later remade into ChäoS;HEAd NoAH, see ChäoS;HEAd.
- For its anime adaptation under the same name, see ChäoS;HEAd (TV Anime).
- For its manga adaptation, see ChäoS;HEAd Manga Adaption.
- For the parody light novel, see ChäoS;HEAd (Light Novel).