The Seven Deadly Sins aid the Sky People against a powerful group of demons hellbent on resurrecting a demonic beast sealed over 3,000 years ago.

The Seven Deadly Sins travel to a remote land in search of the phantom ingredient "sky fish." 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. 
 
(Source: Anime News Network)

Tenkuu no Torawarebito is a compilation booklet given to moviegoers in Japan that contains concept designs and three side stories related to the movie of the same name.
 
Includes: 
1) Awakening of the Black Dream (Kuroki Yume no Mesame / 黒き夢の目醒め) 
2) Looking for an Illusion (Maboroshi wo Motomete / 幻を求めて) 
3) Galand's Warning (Galand no Chuukoku / ガランの忠告)

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