The Seven Deadly Sins Prisoners of the Sky (2018)

Synopsis:

The Seven Deadly Sins Prisoners of the Sky is a Japanese animated film telling the tale of the Seven Deadly Sins (strong & terrible knights as well as protectors of the Kingdom of Liones). The leader of the Sins unknowingly travels to the Sky Castle while searching for a rare ingredient. While the castle is protected by a race of winged people, descendants of a Goddess Clan known as Celestials, securing an evil sealed 3000 years ago, a group of demons attacks it to resurrect the evil. The Seven Sins join hands with the warriors of the sky castle to fight against the demons and the consequence of the fight forms an action-packed plot.