"Oku-san to Issho" is a slice-of-life manga that centers on the daily lives of a married couple, Oku-san and her husband, as they navigate the mundane yet heartwarming aspects of their relationship. The narrative is episodic, with each chapter presenting self-contained vignettes that highlight the couple's interactions, quirks, and shared moments. Oku-san is portrayed as a cheerful, energetic, and slightly mischievous wife who often teases her more reserved and hardworking husband. Their dynamic is characterized by a blend of humor, affection, and occasional misunderstandings, which are resolved through their mutual understanding and love.

The story explores various facets of married life, from domestic routines and household chores to leisure activities and social interactions. Oku-san's playful nature often leads to lighthearted situations, such as her attempts to surprise her husband or her enthusiasm for trying new hobbies. Despite her occasional antics, she is deeply caring and supportive, often going out of her way to ensure her husband's well-being. Her husband, on the other hand, is depicted as a diligent and thoughtful partner who appreciates Oku-san's efforts, even when they result in comedic mishaps.

The manga also delves into the couple's interactions with their friends, neighbors, and extended family, adding depth to the narrative by showcasing how their relationship is influenced by external relationships. These interactions often serve as a backdrop for further exploration of the couple's bond, emphasizing the importance of communication and compromise in maintaining a healthy marriage.

Throughout the series, the tone remains light and humorous, with occasional moments of tenderness that underscore the emotional connection between Oku-san and her husband. The artwork complements the narrative, with expressive character designs and detailed backgrounds that enhance the storytelling. The manga's focus on everyday life and relatable scenarios makes it an engaging and accessible read, offering a charming portrayal of the joys and challenges of married life.