While secretly indulging in daily masturbation, a virgin student harbored intense longing for the legs and ass of his sexy private tutor, Miss Shion. One day, he receives a message card—a challenge from the mysterious phantom thief known as "Cat Woman." That night, a mysterious woman appears wearing a mask and bondage gear, declaring her intent to take his anal virginity. Enchanted by her beauty, the cherry boy succumbs on the spot, losing his anal virginity to her...!?