Hikaru Hoshina is an energetic middle school student with a love for space and the occult. As she draws constellations in her notebook, a small and fluffy creature suddenly appears from it! The creature, which she names Fuwa, turns out to be an alien with the ability to create warp holes. When Fuwa's companions, the aliens Lala Hagoromo and Prunce, arrive on Earth, they declare that they are searching for the Precure, legendary warriors who will save the universe. But an organization known as the Notraiders soon follows and attacks, intending to capture Fuwa and its power. Overcome by a desire to protect Fuwa, Hikaru finds herself transforming into "Cure Star," one of the Precure that Lala and the others have been searching for! It is now up to Hikaru and the rest to fend off the Notraiders' onslaught, discover the rest of the Precure, and find the Star Color Pens, artifacts that will awaken the 12 Star Princess who keep the universe in balance. For the first time in the PreCure TV series' 16-year history, the story of Star☆Twinkle PreCure is set in outer space. It begins when the protagonist Hikaru Hoshina, who is in her second grade at junior high, meets a mysterious creature named Fuwa and two aliens, Lala Hagoromo and Prunce. They have just arrived at the earth. Hikaru learns that "Star Princesses of The 12 Star Signs," who kept the balance of the universe in the the scared are of the Star Sky World far from the earth, were attacked by someone and have been scattered as the 12 "Princess Star Color Pen." Then Fuwa is attacked by Notoraider who seeks to rule the universe, and as Hikaru wants to save the baby fairy, she transforms into PreCure. She deicides to begin a space adventure to collect the "Princess Star Color Pen" and raise Fuwa, who has the key to revive the Princesses.