It had been raining for days and the girls were stir crazy so Papa brought home a goldfish, which the whole family, especially Hello Kitty, liked very much and found cute. For the rest of the day, Kitty did not leave the goldfish's side unless Mimmy or Mama was near as she thought it would be lonely. The next day, Papa bought another goldfish to be the first's friend.
The first goldfish, implied to be a female, is a darker orange, and the second is a lighter orange. They look a bit like Siamese Fighters, but are not.