The plot begins when the protagonist, Hikaru, encounters the aliens Lala, Prunce, and Fuwa while stargazing at night. She discovers the "Star Palace," where the 12 Star Princesses of the constellations maintained the universe's equilibrium until they were invaded. Lala is looking for the renowned Precure warriors to assist her in locating the 12 dispersed "Princess Star Color Pens" and resurrecting the princesses. When an adversary kidnaps Fuwa, Hikaru desires to save her, and a Star Color Pendent and a Star Color Pen emerge, allowing her to change into Cure Star. She then works to collect the pens and raise Fuwa, the key to resurrecting the princesses.