ARCAM sends Rie, a genius professor, to Japan to decipher ancient inscriptions. When she gets kidnapped, a young Spriggan agent comes to the rescue.

ARCAM uncovers a mysterious wooden boat in the snowy Turkish mountains. Yu must face off against a cybernetically enhanced child who holds the key.

Yu must investigate a cursed forest and search for Soma, the mythical nectar of immortality. He teams up with unlikely allies to find a way out.

Yu attempts to retrieve an out-of-place artifact when it gets into the wrong hands. However, the enemy gets away, awakening the deadly object.

Tragedy strikes when Professor Kawahara tries to protect an ancient artifact more potent than a nuclear bomb. In response, a vengeful Yu heads to Egypt.

Yu calls on an old friend to help investigate an eerie island appearing intermittently on an empty ocean. Upon arriving, Yu must face his past.