The film shows the subtle emotions between dogs and humans from the perspective of dogs. A dog accompanies its young master to adulthood and even finds a girlfriend for him. Later, it dies of old age and reincarnates into a dog of another gender and type. The second time, the dog becomes a majestic police dog. After reincarnation again, it becomes a small corgi accompanying a single young woman. After experiencing many reincarnations, it finally returns to its original owner.