Some of the most beautiful coral reefs in the world are found off Okinawa's Kerama Islands at the southern edge of Japan. The 250 different species of coral are a treasure trove for the islands and even provide a means of livelihood for local people. But because of the extremely hot summer in 2007, rising seawater temperatures due to global warming, coral bleaching, and the mysterious so-called white syndrome, the coral reefs are being injured. This program follows local diver and his friends in their desperate fight to protect the coral reefs, revealing the critical situation of the coral reefs and the thoughts of those working to preserve them.