Haneda Ai works as a temporary math teacher at a high school. Her days had been peaceful until one day, she is assaulted by her students on campus. Enduring relentless sexual abuse day after day, her pure, naked body succumbs to pleasure, responding involuntarily despite her resistance. Gradually, her mind is corrupted as well, becoming enslaved to their lustful desires. When she reaches the limits of her physical and mental endurance, she discovers an unbelievable, shocking truth.