The Seven Deadly Sins: Prisoners of the Sky (劇場版 七つの大罪 天空の囚われ人 Nanatsu no Taizai: Tenkū no Torawarebito) is a 2018 Japanese anime film based on The Seven Deadly Sins series written and illustrated by Nakaba Suzuki.
The film premiered in Japanese theaters on August 18, 2018, before it was released on Netflix on December 31, 2018.
Synopsis
To celebrate the birthday of King Baltra Liones, the Seven Deadly Sins travel to a remote land in search of the phantom ingredient "sky fish." In the middle of their search, Meliodas and Hawk end up at a "Sky Palace" that exists above the clouds, where all the residents have wings.
Meliodas is mistaken for a boy who committed a crime and is thrown in prison. Meanwhile, the residents are preparing a ceremony for defense against a ferocious beast that awakens once every 3,000 years. But the Six Knights of Black, a Demon Clan army, arrives and removes the seal on the beast in order to threaten the lives of the residents of Sky Palace. Meliodas and his allies meet the Six Knights of Black in battle.