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Eientei (永遠亭, literally House of Eternity) is the name of a large, old-fashioned Japanese mansion hidden deep within the Bamboo Forest of the Lost. It has hallways that lead out into the far reaches of the sky.
Eientei is currently occupied by a large group. Kaguya Houraisan and Eirin Yagokoro have been hiding there since their exile from the Moon. Other occupants include rabbits—lots of them—all under the command of Tewi Inaba and Reisen Udongein Inaba, who protect Kaguya and Eirin from intruders.
Every month on the night of the full moon, the residents of Eientei hold a Moon Festival (例月祭, Reigetsusai) offering mochi with medicinal herbs pounded into them. Making mochi is thus the main occupation of the Earth rabbits.