The story takes place in Shibuya. Ryuhei had always looked up to his older brother as a child. Even after witnessing his mysterious death, Ryuhei grows up to be a…

Brought together by a mysterious song, a grad student and an engineer lead the fight against an unimaginable force that may spell doom for the world.

An ancient civilization’s relics on Earth hold dangerous powers — it’s up to ARCAM Corporation’s Spriggan agents to keep them out of the wrong hands.