In 2800 years, world is full of magic and monster. Everyone use their magic to fight those monsters. There's a 'darkness' and 'light', darkness was a human that lead those monster, join them to rule the world while the light was a kind human that fight against monster and 'dark'. You, a light, met Taehyung, a strongest darkness. His dark magic really strong, he have a huge tree that can eat every human and make them monsters. You wants to destroy that tree who being a factory of monsters.