Suzume Iwato lives with her aunt in a quiet port town in Kyushu, Japan. One day, on her way to school, she runs into a young man searching for a door and follows him to a ruin in the mountains. Standing alone amidst the collapsed walls is a single old, white door.

As if pulled by an invisible force, Suzume reaches out her hand to open it... Eventually, doors begin to open up one after another across Japan, and they must be closed before disaster crosses over from the other side. Follow Suzume''s journey to do just that in this novelization of Makoto Shinkai''s film, written by the director himself