The Sage of Wind, Ephtal is a reincarnated human, coming from modern Earth. Reincarnated in a new world where magic is real, he decides to devote the entirety of his life in the pursuit of magic. Despite his efforts, though, he discovers that he is absolutely talentless in magic, and breathed his last in anguish. But it isn't the end for him just yet! He reincarnates once again bearing the same name, Ephtal, 400 years later. Having retained his knowledge and power, he steels his resolve and once again sets his sights for the peak of magic! However, in a surprising turn of events, he discovers that magic has terribly declined. In this era where powerful spells are a rarity, his talentless self is now completely unmatched! From the depths of powerlessness to the peak of power, the talentless but peerless mage's journey to the top starts now! (Source: Manga UP!, edited)

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.