- In chapter 4 Kensuke proposes to go to the cinema to watch "Gekiganger-X". The name is a homage to Gekiganger3 and Mazinger Z.
- In an omake written by the author of HERZ, Gendo mentions The King in Yellow.
- In the last chapter a character mentions The Space Trilogy by C. S. Lewis.
Shout Out / Children of an Elder God