"Karakai Jōzu no Takagi-san" centers on the daily interactions between middle school students Nishikata and Takagi. Nishikata, a somewhat shy and easily flustered boy, often finds himself the target of Takagi's playful teasing. Takagi, a clever and observant girl, takes delight in devising schemes to embarrass or outwit Nishikata, using her sharp wit and ability to read his reactions. The series unfolds through a series of lighthearted, episodic vignettes, primarily set in their classroom, on their way home from school, or during casual outings.

The dynamic between the two characters is driven by Nishikata's repeated attempts to turn the tables on Takagi and get the better of her. However, his plans often backfire due to Takagi's quick thinking and her knack for anticipating his moves. Despite his frustration, Nishikata gradually becomes more aware of his growing feelings for Takagi, though he struggles to express them. Takagi, while seemingly focused on teasing, also shows subtle signs of affection, creating a gentle undercurrent of romance beneath their playful rivalry.

The narrative is largely slice-of-life, emphasizing the simplicity and charm of their everyday experiences. Supporting characters, such as their classmates Mina, Sanae, and Nakai, occasionally appear, adding variety to the interactions and providing additional comedic moments. The series balances humor with tender moments, capturing the innocence and awkwardness of adolescence. Through its episodic structure, "Karakai Jōzu no Takagi-san" explores themes of friendship, young love, and the small joys of growing up, all while maintaining a light and engaging tone.