Summer Days with Coo (2007) Kochi Uehara is a fourth grade student living in the suburb of Tokyo. One day he picks up a large stone which turns out to be a fossil of a baby "Kappa" (a mythical Japanese water creature) sleeping underground for the past 300 years, and names it "Coo". Koichi and Coo become good friends and starts living with his family. However, Coo could not adjust to life in Tokyo and starts to miss his family. On a hot summer day, Koichi and Coo decide to go on an adventurous road trip to find his own kind.