2011. Fukushima. Keiko's life changes when her friends are swallowed up by the tsunami. Two years later, unable to mourn, the former trawler captain embarks for the quarantine zone, convinced that they are still alive.

After a gruelling final tour, Aurélien decides to settle in Japan with his wife Nanako, who is pregnant with their first child. As the young couple move into a traditional house in the Japanese countryside, Aurélien discovers an ancient suit of armour in a well, which is about to awaken strange creatures known as Yokaïs.