In the year 2257, natural-born men are on the verge of extinction after the devastating Mana Cataclysm. Kaito Aoyama, an ordinary 17-year-old loner from 2025, awakens in this strange future—suddenly one of the rarest and most valuable people alive.
Enrolled in Peak Harem Academy, a high-security institution built to safeguard and "utilize" the last natural males, Kaito is thrust into a world of breathtaking women who see him as humanity’s final hope: Akane (the cold yet secretly caring secretary), Aya (the gentle tutor longing for a real family), Mio (the energetic fighter driven by loss), and Rei (the stoic combat instructor hiding quiet pain).
Surrounded by teasing training sessions, accidental close encounters, mandatory health checks, and constant pressure to "contribute," Kaito refuses to become just a breeding asset. He wants to live on his own terms in a society that demands he surrender them.
But as monster threats escalate, political superpowers play deadly games behind the scenes, and the women around him begin to see him as more than a resource, Kaito must decide what—and who—he truly wants.
A slow-burn sci-fi harem romance packed with mystery, heartfelt moments, tasteful ecchi tension, and high-stakes action. In a world that wants to own him, Kaito will fight to choose his own path.