Thanks to the discovery of "Patia", a perfect energy source, humanity achieved self-sufficiency in food and fuel, leading to a decline in trade and transportation and ultimately stalling the progression of civilization. Now, genetically modified plants cover the majority of the world's land, hindering travel for all. Cient, the leader of a fortified city, embarks on a journey with his daughter Ruri to search for the lost technology, "Patia". Along the way, Ruri becomes separated from her father and is attacked by a massive humanoid weapon from the ancient era. Fortunately, a fellow traveler named Tekuni, who is in the midst of her training as a Wazabito fighter, comes to Ruri's aid and saves her life.