Each story of Bokurano: Ours tends to focus exclusively on one character - the next pilot. It starts with some background information on the character and their underlying motivations while building up to their battle. The episodes themselves are named after the character currently being focused on.
During a summer camp, 15 children, 8 males and 7 females, find a grotto by the sea. Deep within they discover working computers and some electronic equipment, and later the owner, a man who introduces himself as "Kokopelli". Kokopelli claims to be a programmer working on a brand new game, in which a large robot has to defend the Earth against fifteen alien invasions. He persuades the children to test the game and enter into a contract. All but one of them agree, and a moment later they mysteriously awaken on the shore, believing what happened was just a dream.
That night, two giant robots appear suddenly by the beach. They find Kokopelli already inside and controlling the black robot in order to defeat the white enemy robot. During battle, he gives the children a brief tutorial on how to pilot the robot as he destroys the enemy. Once he has finished, he tells the children that they are on their own now and sends them back to the beach. As the children are teleported out, one child observes Kokopelli whispering "I'm sorry".
The next night, a small creature calling himself "Koyemshi" appears and claims to be their guide. He then teleports the children into the black robot. Takashi Waku is the first pilot of the robot, which is named "Zearth" by Maki Ano. Upon winning the fight, Waku is accidentally 'knocked' into the sea by Jun Ushiro. The second pilot, Masaru "Kodama" Kodaka, dies unceremoniously after defeating his opponent. Koyemshi explains to the children that Zearth runs on life force, and the cost of every victory would be the life of its pilot..,..

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Volume 03
Volume 04
Volume 05
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Volume 07
Volume 08 
Volume 09
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Volume 11