"Ocha-ken: Ryokutto Monogatari" is a family-friendly anime series that revolves around the adventures of anthropomorphic tea characters, known as the Ocha-ken, who embark on a journey to explore the world and learn about tea culture. The main characters include Houji-kun, a green tea enthusiast with a cheerful and curious personality; Kocha-kun, a bold and energetic black tea character; and Aojiru-kun, a health-conscious barley tea figure. Together, they travel across various regions, encountering different types of tea and learning about their origins, preparation methods, and cultural significance.

The narrative is episodic, with each episode focusing on a specific type of tea or a related cultural aspect. The Ocha-ken often interact with humans and other anthropomorphic characters, solving minor problems or misunderstandings related to tea. Their adventures are lighthearted and educational, aiming to introduce viewers to the diversity of tea traditions around the world. The series emphasizes themes of friendship, curiosity, and the joy of discovery, making it accessible to a younger audience while also appealing to tea enthusiasts.

Throughout the series, the Ocha-ken face challenges that test their teamwork and knowledge, but their shared passion for tea helps them overcome obstacles. The show incorporates elements of humor and whimsy, with the characters' unique personalities adding depth to their interactions. By blending educational content with entertaining storytelling, "Ocha-ken: Ryokutto Monogatari" offers a unique perspective on tea culture, making it both informative and enjoyable for viewers of all ages.