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One day, a tiny fraction of human babies began to grow to immense sizes from birth. Humanity calls them Giants. Ordinary humans continue to live in their original habitats, while the Giants live on artificial islands specifically built for them on Earth. However, Guest, a giantess who felt too stifled by the isolation, went to sightsee in a human city. She accidentally knocked over a tree, and while no one was killed, a person was seriously injured. Consequently, Guest was sent to prison. The prison is equipped with giant-sized showers, toilets, and other facilities. All facilities for Giants are over 200m tall. Guest is the only Giant in this prison. Average Giant height: 150m