Momoko Futo is an ordinary high school student navigating her daily routine. Despite her relaxed and cheerful demeanor, her life is far from boring, as her eccentricity and clumsiness consistently add excitement to her days. She is always accompanied by her two best friends: the adorable and innocent Mayumi Furui, and the composed and cool Shibumi Shibusawa. Without any spoken dialogue or narration, Joshikausei aims to depict the comedic antics these girls engage in through the expressive sounds and gestures they make.