The demon-infested dimension known as “Mato” has emerged, posing a grave threat to humanity. However, a mysterious “peach” tree that grows within this realm bears fruit capable of granting extraordinary powers—but only to women. As a result, women ascend to positions of power as humanity’s protectors, while men are relegated to lesser roles, struggling for recognition and purpose.

Enter Yuuki Wakura, a diligent and skilled high school senior whose older sister vanished during a Mato outbreak five years ago. As he contemplates his bleak future, a sudden Mato event engulfs him. Rescued from demons by Captain Kyouka of the Anti-Demon Corps, she grants him powers by making him her “slave,” transforming him into a formidable beast-like warrior capable of annihilating the monstrous threats. However, this newfound power comes with an unexpected cost—and it’s not Yuuki who has to bear the price.