Possum, an archaeologist from the Kingdom of Emgrand, does no research and does nothing but fish. One day, while out on an adventure , possum finds a note in his missing uncle's book about a mysterious ancient civilization that worship fish as messengers of gods. Possum sets out on a journey with his favorite rod in order to get closer to his admired uncle, a famous archaeologist, and above all, to meet a fish he has never seen before.