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. 朴素与伤感之诗。相濡以沫,不如相忘于江湖。妖怪现形记。这个夏天,遇见你实在太好了。美好又感人。给每个人一块净土。夏天过去了我们该心怀感激的长大了。。懊丧狗狗的独白(泪点)。百年之夏。给河童之夏,给这个夏天。。