In this chapter, we learn that the gravity of the moon is much weaker than that of the Earth, and that the inhabitants of the "lunar world" do not live on the moon nearly as often as they do in the "man-home" world. Aika and her friend, the president aria, come to visit the underground world, and the two of them discuss the differences between the two worlds. First, they discuss the difference between the Earth and the moon, and then they discuss how they work to make the moon's gravity uniform. They talk about how they send rocks into the Earth's core, which is then pulled down by the gravitational pull of the stars. They discuss the food they eat, and Aika wonders why they talk like old men. She wonders if it was the "power of attraction" that brought them together.