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Kenichi is at the college archaeology activity when one day a strange device appears. When they all go to examine it, a bright light emanates from it and the bodies of those present are switched. Sakajyo has always wanted something from Kenichi, and when she suddenly finds herself in the body of Kenichi's friend, she seizes the opportunity. But not only the bodies are switched by the mysterious device. The ones affected are also touched by an insane horniness.