The rural American west is the setting for this OVA, in which a bizarre and brutal attack on a NASA base in Arizona attracts the attention of a French secret service agent, Monsieur Lassar, when a dead CIA agent is found floating on the Seine in Paris. Lassar is convinced that these two events are related, and sets out to prove it. His investigation leads him to film star Lamia Vindaw and a vampire cult that may be far more vicious and dangerous than its eccentric exterior makes it seem.

Ushio is a freediver with strange powers. He and his friends are at a tropical land in search of a rare fish, the Blue Butterfly. This pursuit leads them to Ayuuru, a local girl who might know where to find the legendary fish.