| Album | Wild Arms the 4th Detonator Original Score |
| Composer | Masato Kouda |
| Disc | 2 |
| Track | 6 |
| Length | 3:25 |
| Instrumentation | Drum machine, synth |
| Previous Track | The Shining Spear Pierces the Darkness |
| Next Track | Beckoning Bewitching Princess |
Nightmare Spiral (Japanese:ナイトメア 螺旋) is a song used in Wild Arms 4 throughout Wunderweltraum, and is a techno-style reprise of REASON Which Opens the Moment, fittingly as the pocket dimension the player party finds themselves in is full of debris from the Eulalia they were previously transported from.