"Let's Nupu-Nupu" is a comedic slice-of-life anime centered around the daily lives of a group of anthropomorphic animals living in a whimsical, lighthearted world. The narrative primarily revolves around Nupu, a cheerful and slightly naive rabbit, and his diverse group of friends, each with distinct personalities and quirks. The series is episodic, with each episode focusing on small, self-contained adventures or misadventures that highlight the characters' interactions and the humorous situations they find themselves in.

The setting is a vibrant, fantastical town where the characters engage in everyday activities, such as attending school, working part-time jobs, or participating in local festivals. Despite the mundane nature of these activities, the series infuses them with absurdity and charm, often exaggerating scenarios for comedic effect. For example, a simple trip to the grocery store might escalate into a chaotic competition to secure the last item on sale, or a school project could turn into an elaborate, over-the-top performance.

Nupu, the protagonist, is characterized by his boundless optimism and occasional clumsiness, which often leads to humorous outcomes. His best friend, a sarcastic and pragmatic cat named Mii, frequently serves as the voice of reason, though her efforts to keep Nupu grounded are often in vain. Other key characters include a shy but artistic duck named Piyo, a mischievous and tech-savvy raccoon named Rara, and a laid-back, food-loving bear named Kuma. Each character contributes to the dynamic of the group, creating a balance of personalities that drives the humor and heart of the series.

The plotlines are generally light and family-friendly, with an emphasis on friendship, teamwork, and the importance of embracing life's small joys. Conflicts are resolved quickly and amicably, often with a moral or lesson subtly woven into the narrative. The tone remains consistently upbeat, with a focus on delivering laughs and endearing moments rather than delving into deeper or more serious themes.

Overall, "Let's Nupu-Nupu" is a cheerful, episodic series that thrives on its quirky characters and their amusing interactions. Its straightforward, feel-good approach makes it accessible to a wide audience, particularly those seeking a lighthearted escape into a world of playful antics and whimsical charm.