Mysterious creatures named Archons suddenly appear in the world, and humanity faces the threat of annihilation from them. Only the Chalice, the source of humanity, can defeat the powerful Archons. So, the humans assemble an Archon-slaying unit, the Goulart Knights, from fighters who have the ability to bring forth the Chalice to fight for mankind.

Source: ANN

Note: Bundled with first collected volume of writer Miyajima Takumi and artist sion's manga series.

AniDB | ANN | MAL

Other: Everlasting Note
Sequel: Goulart Knights: Evoked the Beginning White