With the discovery of 'Patia', a revolutionary energy source, humanity achieved unprecedented self-sufficiency in food and fuel, leading to a decline in trade and civilization's progress. Now, vast genetically modified plants dominate the Earth, hindering travelers. Cient, the ruler of a fortified city, embarks on a journey with his daughter Ruri to unearth the lost technology 'Patia'. When Ruri becomes separated from her father, a colossal humanoid weapon from ancient times threatens her. Fortunately, a globetrotting fighter named Tekuni, training as a 'Wazabito', comes to Ruri's rescue.