First-year middle school student Amaha Yui and her twin sister Chouma were involved in a traffic accident one day. Yui survived, but her beloved sister Chouma was lost forever. A year passed. Yui's body recovered, but her heart was deeply wounded, and she lived each day as if she were dead while still alive. One day, she rescues a mysterious creature. Its true identity was a blue bird that spoke human language—the fairy Shiru, a legendary warrior Pretty Star. Cursed by an enemy and transformed into a frog, Shiru had journeyed here over many years to save the child of the previous Pretty Star, who had fallen in battle and fallen asleep. Yui seems to possess the aptitude to be a Pretty Star. Normally, Pretty Stars operate in pairs. However, due to a certain incident, one half of the transformation item was lost, forcing her to fight alone now. Two wounded hearts and the encroaching grasp of the enemy's evil. Faced with this desperate situation, what decision will Yui make? Now is the time—to transform!