Yuuna Yuuki leads a double life as a hero, not just in her school's Hero Club but also in the face of a new threat. When sinister forces known as Vertexes endanger her world, Yuuna and her friends, including Mimori Tougou and the Inubouzaki sisters, are tasked by a mysterious app to become magical girls and combat this menace. Balancing schoolwork, charity events, and intense battles, they must confront the realities of their powers and the essence of true heroism in a fight to save their beloved world.