It is about a group of middle-school students who unwillingly assume the task of piloting a giant mecha named Zearth in a series of battles against mechas from parallel worlds, where the survival of Earth is dependent on their continuing to win at the cost of the life of the pilot of each battle. 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.