Hatsuki is the Most Expensive Old Man in the World and the only known individual who remembers the exact locations of treasures once owned by Earth's ancient empires, kingdoms, dynasties, and forgotten civilizations. He possesses mastery over the four energy systems known as Ki, Qi, Ri, and Nen, allowing him to survive for more than one million years while maintaining a functional body. Numerous governments, collectors, and underground organizations attempted to purchase or imprison him so far.