"Ageha 100%" is a manga series that revolves around Ageha Yoshino, a high school student who becomes entangled in the world of modeling after a chance encounter with a talent scout. Initially, Ageha is uninterested in the fashion industry, but circumstances lead her to join the prestigious modeling agency, GBN. The agency is known for its competitive environment, and Ageha must navigate the challenges of balancing her school life with her newfound career.

The narrative explores Ageha's growth as she learns the intricacies of the modeling world, facing rivalries, self-doubt, and the pressures of maintaining her identity amidst the industry's demands. Her journey is marked by interactions with other models, each with their own ambitions and struggles. Key characters include Ryou Asagi, a top male model who becomes a mentor figure to Ageha, and Shouko Kiriya, a fellow model whose competitive nature often puts her at odds with Ageha.

As the story progresses, Ageha's determination and resilience are tested as she strives to prove herself in a world that often prioritizes appearance over substance. The series delves into themes of self-discovery, perseverance, and the pursuit of dreams, set against the backdrop of the glamorous yet cutthroat fashion industry. Through her experiences, Ageha evolves from a reluctant participant to a confident and driven individual, carving out her own path in a challenging and often unforgiving profession.