An eighteen‑year‑old named Tsukasa Mizugaki failed his university entrance tests, yet by leveraging a few contacts he secured employment at the Sion Artificial Intelligence Corporation. The company develops "Giftias," sophisticated androids that are nearly indistinguishable from ordinary humans. Unlike people, each Giftia"s life span tops out at 81,920 hours—about nine years and four months. Terminal Service One, the division Tsukasa joined, is tasked with retrieving Giftias that have reached their expiration point before they lose memories and turn hostile.
Soon after arriving at Terminal Service One, Tsukasa is paired with a striking Giftia called Isla. She is an experienced field agent and regarded as the top specialist in Giftia recoveries, despite her small stature and calm demeanor. Their partnership quickly deepens as they navigate the intense perilous world of decommissioning androids. Time is short, and Tsukasa must confront his growing affection for Isla before her countdown ends. No matter how deeply one yearns, nothing endures forever.