15 children, 8 boys and seven girls, are enjoying their camp together once they suddenly discover a grotto by the ocean . once they enter the mysterious place they find an area filled with computers, also as a person named Kokopelli, who introduces himself because the owner. He claims to be performing on a game which involves an enormous robot that has been designed to guard the world from 15 different alien invasions. Kokopelli hasn’t been ready to test the sport yet, so he persuades about one among the youngsters to sign a accept what he claims are going to be a fun adventure.
However, as soon because the contracts are signed things start to require a way darker turn. In Bokurano, the youngsters must now pilot the enormous robot Zearth one at a time within the hopes that they’re going to have what it takes to defeat all of the upcoming enemies. But Kokopelli has overlooked one vital piece of information: the enormous robot Zearth’s energy source.