"Yuyushiki" is a slice-of-life comedy anime centered around the daily lives of three high school girls: Yuzuko Nonohara, Yukari Hinata, and Yui Ichii. The narrative unfolds through their interactions, often revolving around mundane yet humorous situations, as they navigate school life, friendship, and their shared membership in the Data Processing Club. The club, which they join due to its lack of strict requirements, serves as a backdrop for their quirky conversations and activities, though it rarely involves actual data processing.

Yuzuko is energetic, mischievous, and often the instigator of the group's antics. Her playful nature contrasts with Yukari, who is more reserved and thoughtful but equally prone to odd behavior, particularly her fascination with random trivia and her tendency to overthink. Yui, the most level-headed of the trio, often acts as the straight man to Yuzuko and Yukari's eccentricities, though she occasionally participates in their silliness. The dynamic between the three characters drives the series, with their banter and reactions to everyday situations forming the core of the humor.

The plot lacks a central storyline, instead presenting a series of episodic vignettes that highlight the girls' interactions. These episodes often feature absurd or surreal humor, with the characters engaging in nonsensical conversations, wordplay, and imaginative scenarios. Despite the lack of a overarching narrative, the series maintains a lighthearted and endearing tone, emphasizing the charm of its characters and their friendship. The anime captures the essence of adolescence, focusing on the small, often overlooked moments that define everyday life, while infusing them with a sense of whimsy and humor.