Transmigrated as Diana Claire into a war-torn European realm, I find myself trapped in a captive-romance narrative I never volunteered to enter. Mistaken for the noble protagonist's sister—who suffers neglect and cruelty within her ancestral halls—I become the unwilling prize of a kidnapping orchestrated by a mysterious Duke. His abduction saves me from that hellish existence, yet traps me in something equally perilous. "Don't abandon me, Diana. Promise you won't die." My captor is a contradiction wrapped in aristocratic elegance: a handsome, educated madman. He visits my confinement with ritualistic precision, observing me as though I were a priceless artifact he's guarded fiercely. His gaze radiates asceticism and decadence simultaneously—restrained yet burning with dark desire, scholarly yet intoxicating. Beneath his gentlemanly refinement and graceful bearing lies a twisted psychology. This is no ordinary obsession but something darker, a pathological devotion that permeates everything with an unsettling artistic quality—beautiful and terrifying in equal measure. "I desire to annihilate everyone save you, my Diana." Trapped with a male yandere consumed by delusions of possession, I attempt the impossible: to control the uncontrollable, to humanize the inhuman. My survival depends on navigating schemes within schemes, royal machinations, and sibling rivalries while managing a captor whose love might prove more lethal than any enemy. The line between salvation and damnation blurs with every passing day. Once, the world called me a madman's captive.