一只可爱的拉布拉多犬被选去接受导盲犬的培训。为了让它与人类建立感情，它被寄养在一对夫妇的家里，因为身上有一个棕色的胎记，像一只飞翔的海鸥，便给它取名小Q。训练十分艰苦，但小Q还是成为了导盲犬，认识了第一位主人渡边先生，可是渡边先生却怀疑。情况刚有了好转，渡边先生却病倒了，小Q只好回到了训练中心。 小Q已经在训练中心度过了7年，这时它又能回到了“养父母”的家了，可是它却患病了……
As a Labrador puppy, Quill is sent to live with a couple, Isamu and Mitsuko Nii, who work as volunteers, training guide dogs (seeing eye dogs). When he grows to an adult dog, he is taken to a guide dog school, by a friendly, yet firm trainer Satoru Tawada. Although Quill is a little slower than the other dogs at the school, he seems to have an unusual 'empathy' and remarkable patience with his trainers. Tawade decides that Quill would be the ideal guide dog for Mitsuru Watanabe, but Wanatabe, a lonely and ill-tempered middle aged man, isn't as enthusiastic - he would "would rather sleep than be dragged around by a dog.". From here, the story is narrated by Wanatabe's daughter, Mitsuko, and slowly, Wantanbe is rehabilitated, venturing into the outside world, and learning, not only to trust other humans, but the animal at his side who guides him.
