Meliodas and the crew face their final fight before everything settles into peace, and the show actually lets it matter, not by dragging out the ending, but by cramming genuine stakes into the space between what you thought was over. The original manga's last chapter is here, which means this isn't filler pretending to be canon. You get the actual ending the series earned, not a negotiated compromise between the TV run and the source material.

A new age of peace is under threat. A sinister coalition of magical forces emerges, wielding power that could bring ruin to everyone. Meliodas and his companions return to the fight to defend it. Set between the last two episodes of Fundo no Shinpan, the film tells an original story written by the manga's creator and also adapts the manga's closing chapter. Expect fantasy action and adventure, with comedy and some ecchi humor mixed into the fighting.