A young female ninja skilled in ninjutsu. She is entrusted with the task of delivering a secret letter to a neighboring country to save her country from crisis. However, on the way, she is captured by a cruel torture unit of the enemy country. A woman who values chastity has her breasts and labia exposed by the beasts, and is violated, shamed and humiliated, and even her anus is tormented in a cruel treatment. Perhaps a vile drug has been administered to her, but she becomes more and more aroused and loses her reason. She is made to orgasm again and again, and is transformed into a lascivious woman.