Nanatsu no Taizai Movie: Tenkuu no Torawarebito

A group of adventurers seeks the mythical "sky fish" in a distant region. Two of them, Meliodas and Hawk, arrive at a floating "Sky Palace" inhabited by winged people. Meliodas is wrongly accused of a crime and imprisoned. The palace's inhabitants are preparing for a ritual to protect themselves from a powerful creature that awakens every 3,000 years. However, an army known as the Six Knights of Black arrives and breaks the creature’s seal, endangering the palace. Meliodas and his companions confront the Six Knights of Black in battle.