The ranch is named after the owner's sister, Romani, with the owner being Cremina. The ranch is famous for its Chateau Romani, a special milk that can give Link an endless supply of magic.
On the first night, aliens invade the ranch with the intent of abducting all of the cattle. Romani is aware of the aliens, referring to them as "ghosts" and busy training with a bow to defend the ranch. Since her sister doesn't believe her, Romani asks you to help her fend off the "ghosts" that come to take their cattle. If you don't defend the cattle and return to the Ranch, then you'll see Cremina crying about how she should have believed Romani about the "ghosts".