In a world of magic, humans, demihumans, and oni are engaged in a conflict with each other. Princess Saltorine, also known as Sally, embarks on a journey to locate Mikoto Kibitsu. As she travels across the land, Sally uncovers hidden truths about her lineage and learns about the oni's incredible power capable of eradicating humanity. However, Sally possesses a powerful peach sigil that grants her superhuman abilities, an advantage in the battle against the oni. Sally rejects discriminating against humans, demihumans, and oni, hoping that one day they will achieve peace. On the other hand, Mikoto possesses the same power as Sally's but with greater control, and his objective is to annihilate all oni entirely. As they cross paths, the power they wield will determine the future of the world—whether they will live together in harmony or suffer total destruction.