In a world governed by the Black Witch, imprisoned within the moon and only facing judgment during the rare Hexennacht event, the chosen magical girls, victors in their own right, stand as the formidable adversaries against this dark force. Horinouchi Mitsuru, vying to become the most powerful as the Eastern Japan representative, encounters a peculiar girl named Kagami Kagami, bearing mysterious abilities. A collision of powers ensues as these two girls unite to harness their strength and combat the looming threat, striving to rescue the world through their unique capabilities.