Onsen Shâku plot
In Atsumi City, where a huge tourist complex is being built under the leadership of Mayor Mankan, a series of incidents have occurred in which people have suddenly disappeared while bathing in onsen. In addition, bodies of unknown people have been found attacked by sharks in the sea. Police chief Tsuka and marine biologist Kose, who investigate, discover the shocking truth that ferocious sharks from ancient times have come back to life and are freely moving among the hot springs and attacking people. The villagers decide to join forces to protect their beloved hometown.