After seven colorful shooting stars land on Earth, they grant terrifying powers to those who possess them, twisting their desires into monstrous forms. Doctors Mishina and Kishiwada secure the red, green, and blue stars for research, eventually creating the powerful 'Musumet' helmet to harness and amplify these abilities. With the goal of maintaining world peace and preventing disasters caused by the remaining stars, the doctors establish the secret organization MET. Despite Mishima's untimely death, his daughters Aoi, Midori, and Kurenai inherit his mission, transforming into Musumet to fulfill his legacy. Balancing their superhero duties with everyday life, the girls face challenges wearing their makeshift hero attire in various situations, from school uniforms to swimsuits. Amid their heroic exploits, they navigate typical teenage experiences and romantic aspirations. Can they juggle saving the world and navigating relationships simultaneously?