Seven Deadly Sins : Prisoners of the Sky

The Nanatsu no Taizai are traveling to a distant land in search of the ghost ingredient "Fish of Heaven" to offer it to King Baltra for his birthday. Meliodas and Hawk end up in a "Palace of Heaven" (Sky Palace), a place that exists above the clouds and where all the inhabitants have wings. Meliodas is however confused with a boy who has committed a crime and is thrown in prison. Meanwhile, islanders are preparing a defense ceremony against a ferocious beast who wakes up only once every three thousand years. But the Six Knights of Black, an army of the Demon Clan, arrive and remove the seal of the monster to threaten the lives of Sky Palace residents. Meliodas and his allies will meet the Six Knights of Black during the battle ...

This is an animated film announced at the same time as the release date of Nanatsu no Taizai: Imashime no Fukkatsu. The Nanatsu no Taizai are traveling to a distant land in search of the ghost ingredient "Fish of Heaven" to offer it to King Baltra for his birthday. Meliodas and Hawk end up in a "Palace of Heaven" (Sky Palace), a place that exists above the clouds and where all the inhabitants have wings. Meliodas is however confused with a boy who has committed a crime and is thrown in prison. Meanwhile, islanders are preparing a defense ceremony against a ferocious beast who wakes up only once every three thousand years. But the Six Knights of Black, an army of the Demon Clan, arrive and remove the seal of the monster to threaten the lives of Sky Palace residents. Meliodas and his allies will meet the Six Knights of Black during the battle ...