The 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, his life with a foster family until his first birthday, followed by highly specialized schooling in guiding the sightless. He is then paired with a blind man named Watanabe Mitsuru who is at first reluctant to rely on Quill. But Quill's great patience, gentleness and skill eventually wins him over and they become inseparable friends.