During the summer vacation, 15 boys and girls came to the nature school. There, they met a mysterious uncle who called himself "KOKOPERI" and invited them to start a "game". The so-called "game" is to control giant robots to fight against robots attacking the earth. The 15 children thought it was an ordinary computer game and made a contract. However, the children did not know the true meaning of the game, let alone the heavy price behind manipulating the robots. In battle after battle, the children went from being excited about the game without knowing the truth, to the pain of watching their companions slowly leave after knowing the truth, and watching their different performances each time they chose the driver but could not terminate the contract, showing the truest side of human nature - panic, anger and sadness, and exposing the dark side of the world through each child's unique life experience.
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