This is a world plagued by demons, who cause its human inhabitants unspeakable suffering. Young demon hunter Xuan Zang, fearlessly guided by his belief in "giving himself for the greater cause", risks his all and conquers a water demon, a pig demon and the demon of all demons, Sun Wukong. He embraces them as his disciples, and melts them with love. Meanwhile, Xuan Zang discovers the true meaning of Greater Love himself. In order to atone for their own sins and save the common people, the four of them embark on a journey to the West that's full of challenges.