In a time when humans and those unlike coexisted,

many revered and feared the Holy Knights for the great powers they possessed.

They are the protectors of the kingdom of Liones.

Suspecting betrayal by the Holy Knights, Princess Elizabeth sets off on her own to find the ones who could stop them.

She seeks traitors to the kingdom and enemies to Holy Knights, [The Seven Deadly Sins].

Elizabeth eventually meets a boy named Meliodas and is swept up into a grand adventure to change the fate of the world.