The narrative is set in a time of heroes, swords, and legends. The land was made by enormous animals, which humans later appropriated. The creatures were enraged by this and began devouring people. Humans prayed to the gods for help in defending themselves. The Kyojuu animals began to proliferate and do significant harm, but people retaliated by hunting the Kyojuu. By using the animal parts that had been dissected, humanity also flourished. Jiiro, who refers himself himself as "a man who has survived death," hunts Kyojuu for a living. A person is pursuing "Twenty and Second Kuumi," whom he encounters. The mysteries of this planet are then started to be revealed by Jiiro and his allies.