While Meliodas and Elizabeth have just found Diane, the sin of envy, they are attacked by a Sacred Knight manipulating lightning. He is called Gilthunder and wants to avenge his father allegedly murdered by the Seven Deadly Sins ten years ago. Very sure of his abilities, he provokes Meliodas in duel! This fight allows them to learn that Ban, the sin of the avarice, is imprisoned in a nearby city... Meliodas, Diane, Elizabeth and Hawk are then preparing to go and deliver him but it was without counting the powerful weird fangs, who are going to put sticks in their wheels with their terrible magical powers...