Three hundred years ago, six men crash-landed on Terra II after their ship blew up. Through genetic engineering, men raise clones instead of children. Unable to clone women, society instead has female servant robots called marionettes who function on very simple AI. In Japoness, a young man named Otaru accidentally discovers a secret chamber in the abandoned pioneer musuem on the outskirts. Inside is a marionette like nobody has ever seen before...

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