"Aho-Girl" is a comedic manga series centered around Yoshiko Hanabatake, a high school girl whose extreme lack of intelligence and impulsive behavior drives the absurd humor of the story. Yoshiko is obsessed with bananas and often acts without thinking, leading to chaotic and ridiculous situations. Her antics frequently involve her childhood friend, Akuru Akutsu, a pragmatic and academically gifted student who constantly finds himself dragged into Yoshiko's nonsensical schemes. Despite his exasperation with her, Akuru often ends up helping or rescuing her, showcasing a reluctant but enduring bond between the two.

The series is episodic, with each chapter presenting self-contained comedic scenarios. Yoshiko's over-the-top personality contrasts sharply with the more grounded characters around her, creating a dynamic that fuels the humor. Sayaka Sumino, a classmate and student council president, serves as a foil to Yoshiko, often reprimanding her for her behavior while occasionally getting caught up in the chaos herself. Another recurring character is Ryuuichi Kurosaki, a delinquent with a soft spot for Yoshiko, whose attempts to win her affection are consistently thwarted by her obliviousness.

The humor in "Aho-Girl" relies heavily on slapstick, wordplay, and exaggerated character reactions. Yoshiko's antics often escalate to absurd levels, such as her attempts to sneak bananas into school or her misguided efforts to "help" her friends. The series also explores the dynamics of Yoshiko's family, including her younger sister, who is just as eccentric, and her mother, who is often exasperated by her daughters' behavior.

While the narrative lacks a central overarching plot, the recurring themes of friendship, loyalty, and the clash between logic and absurdity provide a consistent thread throughout the series. The interactions between Yoshiko and the other characters highlight the contrast between her carefree, impulsive nature and their more rational approaches to life, creating a comedic tension that drives the story forward. The series thrives on its fast-paced, over-the-top humor, making it a lighthearted and entertaining read.