When Natsume comes to her husband's workplace to deliver a package, she accidentally drops her keys. His boss picks them up and uses the opportunity to make her husband stay late for overtime work. The boss then sneaks into their home, finds Natsume napping, ties her up, and subjects her to lewd, relentless torment. Trembling in fear at first, Natsume gradually obeys the boss's commands and comes to accept the situation. While her husband works unaware in the office, Natsume is reduced to a plaything, tormented and ultimately violently raped. This ongoing cycle pushes Natsume's mind and body to the brink.