"Fujilog" is a slice-of-life comedy anime that centers on the daily lives of the Fujino family, a quirky and unconventional household. The series is structured as a series of short, episodic vignettes, each highlighting the absurd and humorous interactions between family members. The Fujino family consists of Fujino-san, the laid-back and often clueless father; Fujino-san's wife, a sharp-tongued and pragmatic woman who frequently scolds her husband for his laziness; and their young daughter, Chie, who is precocious and often acts as the voice of reason despite her age. The family also includes a talking cat named Kocchi, who serves as a sarcastic commentator on the family's antics.

The narrative lacks a continuous overarching plot, instead focusing on the mundane yet exaggerated situations the Fujinos find themselves in. These scenarios often involve Fujino-san's attempts to avoid responsibility, his wife's exasperated reactions, and Chie's attempts to mediate or make sense of the chaos. The humor arises from the contrast between the family's dysfunctional dynamics and their attempts to navigate everyday life, such as dealing with household chores, neighborhood gossip, or unexpected visitors. The series thrives on its absurdity, with characters frequently breaking the fourth wall and engaging in meta-humor.

The tone of "Fujilog" is lighthearted and whimsical, with a focus on character-driven comedy rather than deep emotional arcs or dramatic tension. The interactions between the family members are exaggerated for comedic effect, often highlighting the generational and personality gaps between them. Despite its comedic nature, the series occasionally touches on themes of familial love and the challenges of coexisting with people who have vastly different perspectives. The episodic format ensures that each segment is self-contained, making it easy to watch in short bursts while maintaining a consistent comedic tone throughout.