In a post-apocalyptic Japan ruled by an oppressive royal family, a prophecy foretells of the 'Child of Destiny' who will liberate the nation. Sarasa, overshadowed by her twin brother Tatara, steps into his role after his tragic death at the hands of the Red King. Renamed as the new Child of Destiny, Sarasa vows vengeance against the emperor's son. Amidst turmoil and grief, Sarasa crosses paths with the enigmatic Shuri at a healing hot spring. Their meeting sparks a connection that intertwines their fates, binding them together in a complex web of war, animosity, and unexpected affection.