Something unusual is happening in the waters off the Sanriku coast. Fishers are catching fish from southern waters, which they have never seen before, and on the desolate seabed, countless numbers of emaciated sea urchins are crowded together on the rocks, stripped bare of seaweed. Is this really the once-abundant Sanriku coast? The reason for this devastation is the rising sea temperature due to climate change. The sea is undergoing a very serious change. Follow the fishers searching for a solution to this environmental crisis as they themselves are at the mercy of these dramatic changes.