Koro no Dai Sanpo is a short film shown exclusively at the Ghibli Museum in Mitaka. The story follows a puppy named Koro who, after his owner Sawako leaves for school, rushes out of the house and soon becomes lost. As he explores unfamiliar streets, Koro narrowly escapes being run over by a car and is threatened by an alley cat. For the young dog, every encounter outside is new and an exciting adventure. Meanwhile, Sawako returns home to find Koro missing and frantically searches for him.