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".
Ryuichi and Kotaro are brothers who lost their parents in an airplane crash. They're taken in by the chairman of Morinomiya Academy, who lost her son and daughter-in-law in the same crash, on one condition: Ryuichi has to babysit the kids at the daycare room in the school! This room was opened to help the school's teachers who had kids to take care of, but it suffers from a lack of staff until Ryuichi becomes the first member of the babysitter club formed to solve that problem.
Hayato Hayasugi (his last name is a pun on the words for "too fast") and other children will serve as conductors to pilot the Shinkalion. The Shinkalion robots are various models of real-life Japanese bullet trains (shinkansen) that transform into robots to fight an unknown evil to protect the safety and peace of Japan.
The children must work together with the adults of the Shinkansen Ultra Evolution Institute (SUEI) to defeat a monster that looks like a jet black bullet train.