When the Japan Coast Guard investigates an abandoned yacht in Tokyo Bay, their boat is destroyed and the Tokyo Bay Aqua-Line is flooded. After seeing a viral video of the incident, Deputy Chief Cabinet Secretary Rando Yaguchi theorizes that it was caused by a living creature. His theory is confirmed when news reports show a massive tail emerging from the ocean. Shortly thereafter, the creature moves inland and crawls through the Kamata district of Tokyo in the midst of inadequate evacuation. The creature leaves a path of destruction and numerous casualties, and evolves into a bipedal red-skinned form before it begins to overheat and returns to the sea. The government officials focus on military strategy and civilian safety, while Yaguchi is put in charge of a task force to research the creature. Due to high radiation readings, the group theorizes that it is energized by nuclear fission. The U. S. sends a special envoy, Kayoco Anne Patterson, who reveals that a disgraced, vehemently anti-nuclear zoology professor, Goro Maki, had been studying mutations caused by radioactive contamination and theorized the appearance of the creature, but he is disbelieved by both American and Japanese scientific circles. The U. S. then prevented him from making his conclusions public. The abandoned yacht discovered in Tokyo Bay was Maki’s, and he left his research notes, jumbled into a code, in it before disappearing.