Viz Edition Release Date: February 16, 2010
One summer, fifteen kids innocently wander into a nearby seaside cave. There they meet a strange man who invites them to play an exciting new video game. This game, he explains, pits a lone giant robot against a horde of alien invaders. To play the game all they have to do is sign a simple contract. The game stops being fun when the kids find out the true purpose of their pact.
Bokurano plot centers around a group of 15 children, around 14 years old each.
During one school trip they assume the control of a giant mecha. At first they assume this as a part of kid's play but then the task takes them to real battles against mechas of other worlds.
Now they have to fight, because the destiny of the world is in their hands...