Despite being short in stature, Iroe Genma is known as “Elder Sister” throughout her high school campus. As the head of the school's Model Club, Iroe and her team work tirelessly to construct intricate plastic models of cars, boats, and robots. Her fellow members include the fiery Hazuki "Okappa" Okamoto and the practical Makina "Makimaki" Sakamaki. Although their primary goal is to excel as a club, they often face several distractions along the way. From internal club struggles to love confessions, the trio embarks on wild and absurd adventures that are sure to leave you laughing.