Haruna, who fought evil as a magical girl to protect people's smiles, was one day transported to an unfamiliar otherworld through a mysterious magic circle. In this world where magical girls did not exist, the Demon King, long defeated by a hero, showed signs of revival, and demonic beasts flooded the land in vast numbers. Learning that even in this otherworld, evil was stealing people's smiles, Haruna stood alone against the horde of beasts threatening to destroy a village. No matter how badly she was wounded, no matter how covered in blood she became, she never let her smile fade as she destroyed evil. Gradually, the name "Magical Girl" began to be etched into the very fabric of this other world.