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Humans have five internal organs, each divided into five elements: the heart governs fire, the lungs govern metal, the spleen governs wood, the stomach governs earth, and the kidneys govern water. The mysterious continent is full of five-element pet beasts, and pet masters can use their organs to seal them. The five elements are mutually reinforcing and the five elements are in conflict with each other. The pet master and the pet beast share weal and woe.