As his final school year nears its close, Yuuki Wakura frets over what lies ahead. He mourns the idea of a mundane future until an unexpected portal pulls him into Mato, a parallel realm teeming with perilous creatures known as Shuuki. Since Mato's existence was first verified, countless incidents of accidental crossings into the other world have become routine and widely reported. To counter the Shuuki menace and rescue souls like Yuuki, an all‑female Demon Defense Force was formed. Its warriors are endowed with the gift of 'Peaches'—Mato fruits that bestow supernatural powers exclusively upon women, granting them resilience. Despite Yuuki's bleak circumstances, he is rescued at the last moment by Kyouka Uzen, commander of the Demon Defense Force's seventh squadron. Although Kyouka excels in combat, her Peach‑derived talent, Slave, has long limited her effectiveness and growth. Slave grants her the power to dominate a living target and siphon its vigor, yet all Shuuki she has subdued were remarkably feeble and easily overwhelmed. When Yuuki and Kyouka are besieged by a massive swarm of Shuuki, she experiments with an unprecedented move: applying Slave to a human for the first time. Her astonishment grows as Yuuki's enslaved form proves far more potent than she had anticipated, surpassing all expectations. Convinced that the young man holds the key to unlocking her full potential, Kyouka extends an offer for him to join the Demon Defense Force—though not as a standard recruit, but as a special operative.
