In generasia, Nightmare (ナイトメア) could be a reference to:
- "nightmare", a song recorded by 12012, track #1 on third mini-album Knight mare.
- "Nightmare", a song recorded by D.D.GAPS, track #8 on their second album HERE IS D.D.GAPS.
- "Nightmare", a song recorded by JAM Project, track #8 on their second album MAXIMIZER ~Decade of Evolution~.
- "Nightmare", a song recorded by Janne Da Arc, track #1 on their second album Z-HARD.
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