The shorts narrate the tale of twin princesses, Berry and Flora, whose mother passed away during childbirth. As they mature, their father selects Berry to assume the title of "Onaka Hime," or Stomach Princess, granting her the ability to cure the kingdom's citizens of sickness and enhance the beauty of its women by utilizing BifiX 1000. Disappointed by her exclusion, Flora persists in her studies. When Berry appears unable to employ the powers of BifiX 1000 to heal an ill woman, Flora steals the product to attempt the cure herself. Upon discovering Flora's actions, Berry retrieves the product before Flora can try to use it.