This drama tells the story of seven huge caves that suddenly appeared in Japan, including a hole larger than a building, a hole that penetrates the clouds, and a hole that appears in the center of the city. People are in chaos and exhausted. They have conducted various investigations, but the true face of the cave is still unknown. Although many people have entered the cave, no one has returned yet. So, there appeared a man who regards the cave as a god-Ozawa, who believes that "there is salvation in the cave." Then, on December 1, a group of eight male and female believers headed by Ozawa gathered at the resort. According to the rules stated by Ozawa, before entering the cave, they must say "Why do you want to enter the cave" and record it. After talking to each other, what kind of future will they arrive at?