Unidentified creatures "Archon" suddenly appear and bring the human beings to a crisis of extinction. A special corps "Goulart Knights" is formed to counter attack Archon. The knights have supernatural power to generate "Holy Grail" from their spirits and battle against Archon.
| Actor | Role |
|---|---|
 Takuma TerashimaAlbireo (voice) | Albireo (voice) |
 Atsushi AbeHokuto (voice) | Hokuto (voice) |
 Yuki KajiNile (voice) | Nile (voice) |
 Kazuma HorieRegulus (voice) | Regulus (voice) |
 Toshiyuki MorikawaChiron (voice) | Chiron (voice) |
 Daisuke OnoMedius (voice) | Medius (voice) |
 Emiri KatoSpica (voice) | Spica (voice) |