Midori Mishina, a teenage student, emerges as a primary user of the Musumet helmets under the alias Musumegreen. As the daughter of Dr. Mishina, the co-creator of the Musumet technology designed to harness fallen shooting stars’ power, she teams up with her sisters Aoi and Kurenai after her father’s death to uphold his mission. Together, they operate within the covert organization MET, safeguarding the world from dangers unleashed by residual stellar forces. Midori sports vibrant green, super-long curly hair and round, emerald eyes. During everyday life, she dons standard school uniforms or casual outfits. Upon transformation, her attire shifts to a specialized battle suit complemented by a helmet, gloves, and boots, though she retains her civilian garments beneath the armored layers. The Musumet helmet enhances her natural physical and mental prowess, heightening her strength, agility, and intellect. As Musumegreen, she confronts star-born threats, frequently thrust into emergencies mid-task—whether clad in her school uniform, swimwear, or casual clothes. Beyond her heroics, Midori juggles typical teenage challenges, striving to balance academics with her longing for personal connections. Athletic, cheerful, and resolute, she embodies the tenacity required to combat adversaries fueled by celestial energy.