The sea urchin: a thorny, mysterious sea creature whose umami-packed meat is loved in Japan, and is used in food ranging from sushi to traditional cuisine to even desserts. We visit the beautiful coast of Iwate Prefecture in Tohoku, northern Japan, to see the innovative ways sea urchin is cultivated. We also see how locals, including a railroad bento lunch box shop, use fresh sea urchin to create dishes you won't find anywhere else.