Tells about a future where drones are common. Drones have played an indispensable and important function in human life. One day, a large meteorite fell on earth, and scientists discovered that it had an infinite source of energy, the "Cosmo Stone", and applied it to a drone, what people call a "space drone."
One day, drone wars around the world broke out, and space drones were active as a weapon of war. As the damage spreads, world leaders proposed a ceasefire and sought to turn drones into symbols of peace, not weapons of war anymore. The result is the "Aerover Championship".
While cleaning his house, eight-year-old Elon finds a summoning device and scooter left behind by his brilliant scientist grandfather. While riding the scooter and wearing the summoning device on his wrist he gets into a dangerous situation. Just then, the Archean necklace his grandfather left behind starts lighting up and summons an ancient Infinite Warrior (a Metalion) named Leo. Leo saves Elon from danger, and develops a liking for Elon. The newly reawakened Leo is appalled by the unruliness of humans and is saddened that Earth’s energy had long been depleted. Leo explains to Elon how he’s a Infinite Warrior and used to be his grandfather’s friend. Leo asks Elon to help him find all the remaining Archean Stones to restore the Earth’s energy. Elon designs a stone detector and uses it to begin his journey with Leo. The pair set off in search of the stones scattered around the world.