In a magical world where humans, demihumans, and oni are heavily at odds with each other, a princess named Saltorine "Sally" Aldike is on a journey to find a person named Mikoto Kibitsu. Traversing the world, Sally comes across many truths that she had been ignorant of due to her lineage—including the knowledge that the oni possess power potent enough to wipe out humanity. Seemingly blessed with a way to counter the oni's might, Sally has a strange power that manifests itself as a sigil resembling a peach, giving her superhuman abilities capable of defeating powerful oni with ease. Even so, Sally refuses to discriminate between humans, demihumans, and oni as much as possible, believing that peace between the three factions could be attainable one day. On the contrary, Mikoto—who also has the same ability as Sally's but with greater mastery—has a different goal. Mikoto is out to kill and torment all oni in existence, stopping at nothing to fulfill this objective. As Sally and Mikoto continue to cross paths, the power they possess will spell the difference between amicable coexistence and utter annihilation. Saltorine Aldike, or Sari, is a bright, cheerful princess who wants to go on an adventure because she is bored of her tiny little castle in the countryside. One day, a hoard of vicious demons known as Oni come knocking on her doorstep, threatening the lives of everyone in the Kingdom. Thankfully, they are saved by a lone traveler named Kibitsu Mikoto who slays these monsters with a mysterious Peach Eye. Shocked by the dangers of the outside world, Sari decides to set off on a journey of her own. Little did she know that she would set in motion a chain of events that will come to determine the fate of this magical world.