"Anime Kapibarasan" centers around the daily lives of a group of anthropomorphic capybaras living in a serene, natural environment. The narrative unfolds in a tranquil riverside setting, where the capybaras engage in simple yet meaningful activities, fostering a sense of community and harmony. The main characters include Kapibara-san, a laid-back and wise elder capybara who often serves as a mentor to the younger members of the group; Chibi, a curious and energetic young capybara who frequently explores the surroundings; and Marron, a thoughtful and observant capybara who often mediates conflicts and offers practical solutions.

The series emphasizes slice-of-life moments, with each episode depicting the capybaras navigating everyday challenges, such as finding food, building shelters, and interacting with other animals in their habitat. The storyline is episodic, focusing on themes of friendship, cooperation, and the appreciation of nature. Conflicts arise occasionally, often stemming from misunderstandings or external threats, but are resolved through teamwork and mutual understanding. The tone remains lighthearted and soothing, with occasional moments of humor and introspection.

Throughout the series, the capybaras encounter various animal neighbors, including a mischievous raccoon, a cautious turtle, and a flock of chatty birds, each adding depth to the world and providing opportunities for the capybaras to learn and grow. The narrative avoids complex plotlines, instead prioritizing the simplicity and charm of the characters' interactions with their environment and each other. The result is a gentle, heartwarming portrayal of life in harmony with nature, appealing to audiences seeking a calming and reflective viewing experience.