Yuki is a quiet schoolgirl. One day, she is lured by a sadistic teacher and taken to a mansion under the guise of a calligraphy retreat. This is no ordinary retreat—it is filled with malicious intent and unchecked desire. Helpless and trapped, Yuki is threatened, betrayed, and gradually subjected to violent assault. Powerless, her body is repeatedly violated. Unable to resist, she can do nothing but endure the relentless humiliation. This is the story of a horrific "calligraphy retreat" experience.