Hiromu Arakawa, award-winning manga creator of the best-selling smash hit Fullmetal Alchemist, draws readers into an intricate new web of magic, intrigue, and life-or-death stakes! In a world where certain humans command mighty supernatural duos called Daemons, it is the birthright of 'the children who sunder day and night' - twins Yuru and Asa - to rule over these powerful entities. Separated from a young age and unaware of the truth of their birth, brother and sister must fight to make their way back to each other, claim their birthright, and save the world... Ancient Daemons awaken to fight a new battle in an age-old war!! A debilitated Akio explains why he betrayed the Kagemori clan to a bewildered Natsuki. Nearby, Mountain God's relics explode without warning, allowing Akio to flee captivity and unite with his enigmatic new companions from western Japan. Hana is subsequently summoned to a clandestine meeting of Higashi Village agents, where the same hostile force that attacked the Kagemoris has planted another set of bombs!