The housewife named Hana, who works as an outside salesman for a securities company, learns one day that her husband has signed a large contract with this wealthy individual at the home of a client she visits to apologize for her subordinate's blunder. Hana, who wants to settle her subordinate's mistake smoothly at all costs, is scolded by her eccentric siblings and, as if compelled, has her clothes stripped off, only to be photographed in that state with a mobile phone. Forced into a situation of no resistance, Hana is, from that day on, called to the home every day as a sex slave dedicated to anal use, where her anus is gradually expanded...