The Holy War begins. A three thousand-year-old seal has been broken, awakening members of the Demon clan. The only person standing in their way is none other than Meliodas. With a difficult battle ahead of him, Meliodas must reclaim his Sacred Treasure if he hopes to stand a chance against these new and powerful enemies. Elsewhere, the Demon clan casts its shadow upon the Fairy King and his comrades and at the end of the ensuing battle, the true Fairy King will be revealed.