The film mainly follows the famous 1597 Battle of Myeongryang during the Japanese invasion of Korea (1592-1598), where the iconic Joseon admiral Yi Sun-sin managed to destroy a total of 31 of 133 Japanese warships with only 13 ships remaining in his command. The battle, which took place in the Myeongryang Strait off the southwest coast of the Korean Peninsula, is considered one of the greatest victories of Yi. Written by Anonymous

The story of the film begins after the events of the second season, at the graduation ceremony of the third-year students. Knowing that the graduation of the third-year members means the end of u's, the nine girls take a walk around the school filled with memories. However, when the students attempt to leave the school gates, a single email is sent to them, and the curtain on a new story for u's begins.

Mirium Jones suffers from schizophrenia. Estranged from her husband because of an illicit affair with a younger woman, Mirium travels alone to the land of her dreams. Sad and lost, she finds herself in an ancient Basilica where she makes a promise to the Devil himself. After returning to the States, Mirium reunites with her husband Gabriel and they set out to begin a new life in a new home, isolated in the forest many miles from the city. Strange images begin to haunt Mirium, and after a violent attack, Gabriel disappears. Now alone and isolated, Mirium's terrifying demonic manifestations begin to drive her to the edge of sanity. Or has the Devil come to take his due? Written by Joseph Paul Stachura writer/director