Bokurano

Fifteen kids spending summer camp by the beach wander into a small seaside cave and discover a hidden chamber, where a peculiar man introducing himself as Kokopelli asks them to join a “game.” He explains that they’ll take turns piloting a robot to defend Earth from alien attackers, and—treating it like an exciting simulation—everyone but one signs the contract.

The same day, the towering machine manifests for real and the children are pulled into its cockpit, forced to watch as Kokopelli fights a matching mechanical opponent nearby. When the battle ends and they’re returned to the ground amid the aftermath, the robot vanishes, leaving them shaken and unsure of what they’ve agreed to. What began as a harmless challenge quickly reveals harsher consequences, tying their choices to fears and histories they never expected to confront.