"Sanpō Shōjo" is a short-form anime series that revolves around the daily lives of three high school girls—Mai, Mii, and Maki—who form a club called the "Sanpō Shōjo" or "Walking Girls." The club's primary activity is walking, and the narrative focuses on their casual, lighthearted adventures as they explore their surroundings, engage in conversations, and encounter various minor challenges or amusing situations. The series is episodic, with each episode highlighting a different aspect of their walks, whether it be discovering new places, meeting quirky characters, or reflecting on simple yet meaningful aspects of life.

Mai is the energetic and optimistic leader of the group, often initiating their walks and encouraging her friends to try new things. Mii is the more reserved and thoughtful member, providing a grounded perspective and occasionally offering insightful observations. Maki, the third member, is playful and mischievous, often adding humor to their outings with her antics. Together, the trio embodies a balance of personalities that drives the series' charm and relatability.

The plot is minimalistic, emphasizing slice-of-life elements and the joy of small discoveries. The girls' walks serve as a vehicle for exploring themes of friendship, curiosity, and the beauty of everyday life. While there is no overarching conflict or dramatic tension, the series thrives on its simplicity and the genuine interactions between the characters. The setting, often featuring serene landscapes or quaint urban environments, complements the tranquil tone of the narrative.

"Sanpō Shōjo" is characterized by its brevity and focus on lighthearted, feel-good moments. It appeals to audiences seeking a relaxing and wholesome viewing experience, free from complex plotlines or high-stakes drama. The series captures the essence of youthful camaraderie and the pleasure of taking life one step at a time.