In the realm of "Mato," a sinister dimension teeming with demons, a unique "peach" tree bears fruit endowed with extraordinary abilities. These fruits offer humanity a glimmer of hope against the looming threat, but there's a catch—only women can harness their powers. Consequently, women ascend in societal standing as guardians of humanity, while men find themselves marginalized, struggling for recognition and basic opportunities.
Enter Yuuki Wakura, a resourceful high school senior grappling with the disappearance of his sister during a previous Mato incursion five years ago. As he contemplates the challenges ahead, an unexpected twist of fate transports him into the heart of Mato. There, he's swiftly rescued from demonic forces by Captain Kyouka Uzen of the Anti-Demon Corps. She bestows upon him powers as her "servant," transforming him into a formidable creature capable of vanquishing demons.
Yet, this newfound alliance comes with an unforeseen cost—one that doesn't fall upon him.