Milf Hitomi Araki faces the shocking scenario of being subjected to anal sex. Born into the family of Araki Kozaburo, the notorious head of the Xavier United Hospital accused of the largest organ trafficking scandal in postwar history, Hitomi is put up for auction at the human specimen market known as "Kentai Kogyo" to pay off immense debts. Overwhelmed by aggressive bidders, she ends up unsold. As a result, she is taken to a special facility called "Kachiku Factory," where she meets Don Narumi. Now, Don Narumi begins his intense anal training to transform Hitomi into a complete human specimen.