"Waimo-kun~Kiiroi Kao Shite Babanban" is a comedic anime series that revolves around the life of Waimo-kun, a high school student who constantly finds himself in absurd and humorous situations due to his peculiar personality and circumstances. Waimo-kun is characterized by his perpetually yellow, expressionless face, which becomes a source of both confusion and amusement for those around him. Despite his odd appearance, he navigates daily life with a mix of naivety and unexpected resourcefulness, often leading to chaotic yet lighthearted outcomes.

The plot primarily focuses on Waimo-kun’s interactions with his classmates, teachers, and family members, each of whom adds to the series' comedic tone. His best friend, a more grounded and level-headed character, often serves as a foil to Waimo-kun’s eccentric behavior, providing a contrast that amplifies the humor. The series also introduces a variety of recurring characters, including a strict but easily flustered teacher, a mischievous younger sibling, and a love interest who remains oblivious to Waimo-kun’s awkward attempts at romance.

Episodes are structured around episodic, self-contained stories that highlight Waimo-kun’s misadventures, ranging from school festivals and exams to family outings and part-time jobs. The humor often stems from misunderstandings, slapstick comedy, and the absurdity of Waimo-kun’s reactions to mundane situations. Despite the comedic focus, the series occasionally touches on themes of friendship, perseverance, and self-acceptance, though these are always presented in a lighthearted manner.

The narrative maintains a consistent tone of playful absurdity, with Waimo-kun’s yellow face serving as a visual gag that underscores his unique perspective on life. The series avoids heavy drama or complex plotlines, instead opting for a straightforward, episodic format that emphasizes humor and character interactions. Through its quirky protagonist and ensemble cast, "Waimo-kun~Kiiroi Kao Shite Babanban" delivers a series of comedic vignettes that highlight the absurdities of everyday life in a high school setting.