"Kokoro Library - Communication Clips" is a short-form anime series that serves as a companion to the main series "Kokoro Library." The narrative revolves around the daily lives of three sisters—Kokoro, Iina, and Aruto—who manage a small, remote library nestled in the mountains. The library, known as Kokoro Library, is a tranquil place where visitors are rare, and the sisters spend their time maintaining the collection, assisting the occasional guest, and navigating their relationships with one another.

Kokoro, the eldest sister, is kind-hearted and responsible, often taking on the role of caretaker for her younger siblings. Iina, the middle sister, is more reserved and studious, often seen engrossed in books or tending to the library's administrative tasks. Aruto, the youngest, is energetic and curious, bringing a sense of playfulness to their daily routines. The sisters' interactions are central to the series, highlighting their bond and the quiet, reflective nature of their lives.

The episodic format of "Communication Clips" focuses on small, slice-of-life moments rather than a continuous plot. Each episode explores themes of connection, communication, and the simple joys of everyday life. The sisters often engage in conversations about books, share personal reflections, and support each other through minor challenges. The library itself serves as a metaphor for knowledge and human connection, with the sisters acting as custodians of both.

While the series lacks dramatic conflict or high-stakes events, its charm lies in its gentle pacing and emphasis on character-driven storytelling. The serene setting and the sisters' harmonious relationship create a soothing atmosphere, making it a reflective and calming viewing experience. The narrative subtly underscores the importance of communication, both through the written word in books and the spoken word between the sisters, reinforcing the idea that understanding and empathy are nurtured through shared experiences and dialogue.