Hikaru Hoshina is a lively middle schooler who adores space and the occult. While sketching constellations in her notebook, a tiny, fluffy creature suddenly emerges from it! She names the being Fuwa, who turns out to be an alien capable of creating warp holes. When Fuwa's companions, the aliens Lala Hagoromo and Prunce, arrive on Earth, they announce that they are hunting for the Precure, legendary warriors destined to save the universe. However, an organization called the Notraiders soon pursues them and attacks, aiming to seize Fuwa and its power. Driven by the urge to protect Fuwa, Hikaru transforms into "Cure Star," one of the Precure that Lala and the others have been seeking! Now, Hikaru and the others must repel the Notraiders' assault, locate the remaining Precure, and find the Star Color Pens, artifacts that will awaken the 12 Star Princesses who maintain the universe's balance.