Eiji Hino is working as a part-time security guard in the Kougami Art Museum, but he is unknowingly drugged by two thieves posing as fellow security guards who put sleeping pills in his juice. While in the middle of robbing the artifact chamber blind, a mass of coins form into an arm that breaks a seal on a mysterious sarcophagus releasing four monsters. The Kougami Foundation, owners of the museum, send their Ride Vendor 1st Squad motorcycle brigade to bomb the museum, intending to trap the monsters known as Greeed inside. However, the Greeed escape, and overpower the squad, while the Kougami Foundation's leader Kousei Kougami decorates a birthday cake, welcoming the Greeed into this world.
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