16-year-old Suzume lives in a quiet town on the island of Kyushu. One day, on her way to school, she meets a young traveler who asks her where the ruins are located. Curious, she decides to explore the area and finds a mysterious door. She opens it and pulls out a strange stone from the ground. Suddenly, a giant entity emerges from the door and causes an earthquake. Now, Suzume and the stranger, who has been transformed into a child's chair, must chase after a mischievous talking cat to close the doors that are opening across the country and prevent further destruction.