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K�ichi Uehara is a fourth grade student living in Higashikurume City, a suburb of Tokyo. One day he picks up what he thinks to be a fossil of an ancient creature but turns out to be a baby kappa (a mythical Japanese water creature) that was sleeping underground for the past 300 years, and he names it "Coo". K�ichi and Coo become good friends and the kappa starts living with the human boy's family. However, Coo cannot not fully adjust to life in present-day Higashikurume and starts to miss his own family. On a hot summer day, K�ichi and Coo decide to go on an adventurous road trip to find his own kind.