The series follows the adventures of Scooby-Doo and the Gang through the eyes of 15 children and their imaginations. Each story begins in the real world and transitions to the stop motion animated imagination of a child.
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".
After losing both parents in a fatal plane crash, teenager Ryuuichi Kashima must adjust to his new life as the guardian of his younger brother Kotarou. Although Ryuuichi is able to maintain a friendly and kindhearted demeanor, Kotarou is a reserved toddler still too young to understand the reality of the situation. At their parents' funeral, they are approached by Youko Morinomiya, the stern chairman of an elite academy, who decides to take them under her care.
However, there is one condition Ryuuichi must fulfill in exchange for a roof over their heads and enrolment in the school—he must become the school's babysitter. In an effort to support the female teachers at the academy, a babysitter's club was established to look after their infant children; unfortunately, the club is severely short-staffed, so now not only is Ryuuichi responsible for his little brother, but also a handful of toddlers who possess dynamic personalities.
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.