"Tsuyoshi Shikkari² Shinasai" is a comedic slice-of-life manga that revolves around the daily life of Tsuyoshi, a young boy who lives with his mother, father, and younger sister. The series primarily focuses on the humorous and often chaotic interactions within the family, particularly highlighting Tsuyoshi's mischievous yet endearing personality. Despite his young age, Tsuyoshi often takes on a more responsible role in the household, frequently reminding his parents to act more maturely, which creates a role-reversal dynamic that serves as a central source of comedy.

The narrative is episodic, with each chapter presenting a self-contained story that explores various aspects of family life, school, and neighborhood interactions. Tsuyoshi's father, a salaryman, is often depicted as lazy and prone to making excuses, while his mother, though caring, can be overly dramatic and easily flustered. Tsuyoshi's younger sister, though less prominent, adds to the family's dynamic with her own quirks and childish behavior. The series also features recurring side characters, such as Tsuyoshi's classmates and neighbors, who contribute to the comedic situations and misunderstandings that drive the plot.

The humor in the series stems from the exaggerated yet relatable portrayal of family dynamics, with Tsuyoshi frequently stepping in to resolve conflicts or prevent his parents from making poor decisions. The manga balances its comedic tone with moments of warmth and sincerity, emphasizing the bond between family members despite their flaws. The art style complements the lighthearted tone, with expressive character designs and visual gags that enhance the storytelling. Overall, "Tsuyoshi Shikkari² Shinasai" offers a humorous and heartwarming look at the everyday challenges and joys of family life, centered around a precocious protagonist who often acts as the voice of reason in an otherwise chaotic household.