Eriko lives a quiet, content life married to her gentle and attentive husband, Seiji. Her world is suddenly upended when a dangerous criminal named Akutsu escapes from prison and breaks into her home while seeking refuge. Upon being discovered, the intruder quickly overpowers Eriko, knocking her unconscious and holding her captive within the walls of her own house. Driven by raw desire, the fugitive forces himself upon her, turning her home into a private prison where she is kept in a state of constant vulnerability and forced submission. Under the threat of violence, Eriko is coerced into endless sexual encounters, with the intruder repeatedly claiming her body and leaving her filled with his seed day after day.
As time passes, a complex and dark psychological shift begins to take hold. Despite the initial terror and the constant threats looming over her, Eriko's body starts to respond to the relentless physical intensity of her captor. The deep, rhythmic thrusts and the constant intimacy create a strange, involuntary familiarity, causing her to crave the sensations he forces upon her. During this period, her husband Seiji remains oblivious, noticing only that his wife appears exhausted, leading him to distance himself from their intimate life. The intruder becomes the sole focus of Eriko's physical existence, dominating her completely while her marriage quietly fades into the background of her captive reality.
Eventually, the intruder vanishes as abruptly as he arrived, leaving the front door open and Eriko alone once more. Though she is finally free, she finds herself struggling with an unexpected sense of loss and emptiness. The lingering impact of her ordeal becomes clear when she discovers she is pregnant. Despite the dark circumstances of the conception, Eriko embraces the news with a surprising sense of joy, forever changed by the man who invaded her life and left his mark behind.
