A world, forever beyond your expectations. In a dark, cramped, underground world of endless tunnels and shafts, people wear protective suits and live out their modest yet happy lives. The princess of the underground community, Patema, goes out exploring as always, inspired by her curiosity of the unknown depths of the world. Her favourite spot is the danger zone, an area forbidden by the rule of the community. Despite being frequently chastised by her caretaker Jii, she cannot hold back her curiosity for the reason behind the rule, because no one would tell her what the danger was. When she approaches the hidden secret, the story begins.

Note: The film hosted its world premiere at France's Annecy, the world's largest animation festival. Screening at Japan started on 9th of November.

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