Nanatsu no Taizai Movie 1: Tenkuu no Torawarebito S01

The Seven Deadly Sins travel to a distant land in search of a phantom material called the "Sky Fish". Meliodas and Hawk are in a "Sky Palace" that exists above the clouds, where all the inhabitants have wings. Meliodas is against the boys who have committed a crime and are thrown into prison. Meanwhile, the inhabitants are holding a ceremony to defend against a ridiculous creature that awakens once every 3,000 years. But the Six Black Knights, a tribal hero army, enter the life of the Sky Palace inhabitants and seal the animals. Meliodas and his allies meet the Six Black Knights in battle.