Princess Elizabeth has recruited Meliodas the Dragon, Sin of Wrath, to help her seek the other Seven Deadly Sins and save the kingdom from war and the grip of the clever Holy Knights. Traveling deep into the forest, the two find the giant Dianne the Serpent, Sin of Envy. But the old friends' reunion is interrupted by the appearance of the slick and lethal Holy Knight Gilsander! Will the trio survive long enough to find the other Sins?