A planet with a rotation period of 30 hours and an orbital period of 600 days (480 days by this planet's standards). Its official name is Seven Deluxe Burger Constellation Theta-d (Guest named it Ice Star). The surface is rich in ice, rocks, and mineral veins, and the faint heat from the core melts the ice to create small hot spring zones here and there. The temperature in the area where the base is currently located drops from -10 to -45 degrees Celsius. The atmospheric density is similar to Earth's, but the oxygen concentration is extremely thin. Life on the planet revolves around the hot springs; producers look similar to coral, and consumers have skin like rock.

A terraforming base installed near the planet's equator. Materials were landed on the planet before the settlers arrived, and it was constructed using robots. Power and heat are supplied by a hydrogen fusion core using hydrogen extracted from water. Inside, edible plants are grown under artificial lights, converting the carbon dioxide and water exhaled by humans into oxygen, and meat can be consumed by cultivating meat cells. It is equipped with all the conditions for a human to live independently, including a medical room and a chemical synthesis room. All construction robots except for one were disassembled to become parts for the base; the remaining one can be piloted to explore the planet. The AI here is currently the only conversation partner for the solitary Guest, and it is hiding the fact that the terraforming of the planet was canceled due to a sudden financial problem with the colonization team. At the center of the base is a 'Cultivate Humanity' button that can be pressed once terraforming is complete; when activated, numerous fertilized eggs will be revived and born as humans.