When Ryota's brother Yata disappears at sea, the intrepid youth and his friends join forces with a slightly trustworthy bank robber, steal a boat and go after him! Of course, there's the little problem that Yata may be lost on a mysterious island where the evil terrorist organization Red Bamboo has enslaved natives to make heavy water for nefarious purposes. And that means dealing with the island's monstrous, 164 feet tall guardian Ebirah, as well as Red Bamboo's arsenal of super advanced weaponry. On the plus side, help may be at hand in the form of a nubile island girl, two tiny fairies, their giant protector Mothra and the big G himself, the mighty Godzilla. Surviving the results of all that 'assistance' may not be guaranteed, but Red Bamboo will never want to tangle with teenagers AND Godzilla at the same time again! Take a South Seas cruise to non stop mayhem and giant monster destruction with EBIRAHT...HORROR OF THE DEEP!