Ten years ago, a group of mercenaries known as the Seven Deadly Sins rebelled against the Holy Knights, the guardians of the kingdom… Since then, they have vanished, and no one knows what became of them. One fine day, a mysterious young girl collapses in the tavern owned by Meliodas, a cheerful boy who travels the world accompanied by his talkative pig. This young girl is none other than Princess Elizabeth, who desperately wishes to find the Seven Deadly Sins. Indeed, they are the only ones capable of fighting the Holy Knights, who have taken the King prisoner and enslaved the entire population of the kingdom! Very soon, she will discover that Meliodas is not just a simple tavern owner, but a warrior of exceptional power...