Professor Simon Wallis, AKA "The Ground Detective," unravels the mysteries behind Japan's fascinating food culture from the ground up. This time, he heads for Minamisanriku after learning from a French chef about the tasty oysters in Sanriku. The oyster farmer he meets reveals that the secret to delicious oysters lies in the forest. But how is the forest linked to tasty oysters grown in the sea? Find out as the Ground Detective discovers the answer deep in the forest.