"Umi Da! Funade Da! Nikoniko, Pun" is a short-form anime series that centers around the daily lives of anthropomorphic sea creatures living in a vibrant underwater world. The main characters include a cheerful and energetic sea slug named Niko, a reserved and thoughtful sea cucumber named Pun, and a playful yet mischievous starfish named Funade. The narrative unfolds through a series of lighthearted, episodic vignettes that highlight their interactions and adventures in their aquatic environment.

The storyline primarily focuses on the trio’s exploration of their surroundings, often encountering other sea creatures and engaging in activities such as treasure hunting, solving minor underwater mysteries, and participating in local festivals. Each episode is structured around a simple, self-contained plot, emphasizing humor, camaraderie, and the whimsical nature of their world. The characters’ distinct personalities drive the narrative, with Niko’s boundless enthusiasm often leading the group into amusing situations, Pun’s cautious demeanor providing balance, and Funade’s antics adding a layer of unpredictability.

Themes of friendship, curiosity, and the joy of discovery are woven throughout the series, with the underwater setting serving as a backdrop for the characters’ growth and interactions. The episodic nature of the show allows for a variety of scenarios, from comedic misunderstandings to heartwarming moments of teamwork. While the stakes are generally low, the charm of the series lies in its ability to capture the simplicity and wonder of everyday life through the lens of its quirky, aquatic protagonists.