After the Life Scale was broken 45 years ago, the barrier between the human and spirit worlds weakened, allowing spirits—born from human emotions—to roam freely. Governments refuse to acknowledge the danger, but guilds secretly prepare for the inevitable catastrophe: the complete shattering of the Life Scale, which will allow all humans to see spirits. Humans are classified by Grant levels, determining their ability to perceive and combat spirits. Spirit Keepers and Avatars are the strongest, with Avatars being the only ones capable of serving as vessels for the legendary 12 Seats—powerful spirits divided between those who seek balance and those who plan to overthrow The One, the being who created them. As tensions rise, guilds battle for dominance, spirits plot their own agendas, and individuals with hidden potential emerge. When war between the spirit and human worlds begins, who will stand victorious, and what price will be paid for ultimate power?