The 124-kilometer Niyodo River is the purest in all of Japan. It possesses a striking hue of blue known as Niyodo Blue that is a testament to the cleanliness of its waters, which have remained pristine despite serving the needs of 100,000 locals. The program vividly portrays the Niyodo through gorgeous photography captured with the latest technology and Masakatsu Takagi's evocative piano score. The Niyodo remains blue from the forests that give it birth to its mouth. Along the way, its waters nurture the colorful wildlife that live in and around the river while also displaying a surprising expressiveness themselves. These aspects are filmed in meticulous detail with the help of guide Nobuyuki Takahashi, a photographer with intimate knowledge of the river. His camera captures a number of beautiful moments, from the glittering rime that serves as the Niyodo's source to the blue sheen that shrouds a plain brown dipper as it dives into the river. This symphony in blue was composed to remind viewers that Japan is home to some of the most beautiful waters in the world, and that it is our duty to protect them even as the nation's rivers continue to be spoiled through industrial development.