Based on a true story, Quill is a sweet, documentary-like story of a yellow Labrador Retriever guide dog for the blind named Quill. We follow Quill from the litter, his selection to become a guide, and his life with multiple families. He is then paired with a blind man named Watanabe Mitsuru who is at first reluctant to rely on Quill but is gradually won over by the dog's gentle patience.