Tatsuya Obayashi rescues a dog from a vacant lot and names it John. The dog is a bit slow, so Tatsuya raises his voice when John fails to return a frisbee quickly. The next day, a new student named Yoshio transfers into Tatsuya's class. Yoshio hopes to make friends, but he becomes a target of bullying. With John’s help, Tatsuya learns patience and discovers how to stand up for his classmate.