Kenji, Yuriko, and their father, who came from Tokyo, got lost and were camping out in a wooded area. When the three wake up, they find a village nearby, but the village is in ruins due to a conflict between the landowner, Kinugawa, and Gonbei, the owner of Nanashino, a field with a thicket of trees. Yuriko's father, who is also a geologist and is interested in Nanashino, finds out that Nanashino is a land where oil is produced, and immediately requests an oil company in Tokyo to investigate...!?