While stargazing, Hikaru encounters the aliens Lala, Prunce, and Fuwa. She discovers the "Star Palace," where the 12 Star Princesses of the constellations maintained universal balance until they were attacked. Lala is seeking the legendary Precure warriors to assist in locating the 12 scattered "Princess Star Color Pens" and reviving the princesses. After Fuwa is captured by an enemy, Hikaru wishes to save him, causing a Star Color Pendent and a Star Color Pen to appear, enabling her transformation into Cure Star. Thereafter, she strives to gather the pens and raise Fuwa, who is essential for reviving the princesses.