Suzume, a 17-year-old girl who lives in a quiet town in Kyushu, meets Souta, a young man looking for a door. Following Souta, Suzume finds an old door in the mountains and reaches out her hands towards the door as if pulled by something. This opened door will bring disaster; thus, Souta must travel around to lock the door to avoid disaster. But then, a mysterious kitten turns Souta into a broken wooden chair. To catch the kitten, Suzume and Souta follow it and travel from Kyushu to Tokyo. “Doors of disaster” begin to appear across Japan simultaneously, and Suzume needs to close and lock the doors one by one to stop the disasters. Unexpectedly, a forgotten truth is waiting for her.