To save her kingdom, Princess Elizabeth has pinned her last hope on the infamous traitors, The Seven Deadly Sins and has set out on a journey with Meliodasthe Dragon Sin of Wrathto seek out the rest of his fellow knights and former friends. Deep within an uninviting forest they find Diane, the Serpent Sin of Envy. Before they can celebrate their reunion, they must deal with an attack from Gilthunder, an electrifying Holy Knight!