Original work by Doujin Author Karukiya, Training a Friend's Mother: My mother becomes a toy for my classmates for three days during the exam. A popular doujin comic depicting a beautiful mother gang-raped by boys is now available as a faithful live-action version!

Asami (Shiraki Yuko) lives in a wealthy family with her husband Junichi, the clinic's director, and her only son Jun. Although he was happy, Jun's grades were poor at school and felt pressure from his husband and stepmother to take over as a doctor in the future. At that time, Jun said he cheated on his classmate Makio's answer during the exam. Asami goes to meet Makio in an attempt to get her to forgive her, and then ends up in a lewd contract. Then, for three days during the exam, Makio comes to the house to teach Jun's study...