"Gakkatsu!" is a short-form anime series that revolves around the daily lives and humorous interactions of a group of elementary school students. The narrative primarily takes place within their classroom, where the students engage in quirky and often absurd conversations, activities, and misadventures. The series is episodic, with each episode consisting of multiple short segments that highlight the eccentric personalities of the characters and their unique dynamics.

The main characters include a diverse group of students, each with distinct traits that drive the humor and interactions. There is the overly enthusiastic and slightly clueless class representative, a quiet and mysterious student who often surprises others with unexpected insights, a mischievous troublemaker who constantly stirs up chaos, and a diligent yet overly serious student who frequently clashes with the others. The teacher, who is often exasperated by the students' antics, serves as a grounding presence, though they are not immune to the absurdity of the classroom environment.

The plot lacks a central overarching storyline, instead focusing on slice-of-life scenarios that emphasize comedy and character interactions. Themes of friendship, childhood innocence, and the unpredictability of school life are explored through exaggerated and often surreal situations. The humor is derived from the characters' exaggerated reactions, misunderstandings, and the contrast between their personalities. Despite its comedic tone, the series occasionally touches on relatable aspects of growing up and navigating social dynamics in a school setting.

The pacing is brisk, with each episode delivering quick, self-contained gags and scenarios. The simplicity of the setting and the focus on character-driven humor make the series accessible and easy to follow. While the narrative does not delve deeply into emotional or dramatic elements, it succeeds in capturing the lighthearted and chaotic essence of elementary school life through its comedic lens.