After years on the road establishing his reputation as Japan’s greatest fencer, Takezo returns to Kyoto. Otsu waits for him, yet he has come not for her but to challenge the leader of the region’s finest school of fencing. To prove his valor and skill, he walks deliberately into ambushes set up by the school’s followers. While Otsu waits, Akemi also seeks him, expressing her desires directly. Meanwhile, Takezo is observed by Sasaki Kojiro, a brilliant young fighter, confident he can dethrone Takezo. After leaving Kyoto in triumph, Takezo declares his love for Otsu, but in a way that dishonors her and shames him. Once again, he leaves alone.

Japan is thrown into a panic after several ships explode and are sunk near Odo Island. An expedition to the island led by paleontologist Professor Kyohei Yemani soon discover something more devastating than imagined in the form of a 164 foot tall monster whom the natives call Gojira. Now the monster begins a rampage that threatens to destroy not only Japan, but the rest of the world as well.

A 400-foot (122-meter) dinosaur-like beast, awoken from undersea hibernation off the Japanese coast by atomic-bomb testing, attacks Tokyo.