A young wife, Rei, lives comfortably with her husband, the company boss, and his brother Shu. One day, while her husband is on a business trip, Shu tells her about an underground room. Intrigued, she goes to investigate, but it turns out to be a trap set by Shu to make her his plaything. As soon as she enters, Rei's freedom is taken away, and she is told, 'From today on, you will live here.' From that day forward, she is imprisoned in the underground room and subjected to endless torment as Shu's toy...
