The Sakuma siblings, the daughter and son of a famous company in a Kanto prefecture.A female college student's older sister, Emi, lives in an apartment in Tokyo that her father has purchased, and her younger brother, Yuji, is also staying there to study for her entrance exams.One day, a man named Kudo visits him and tells him that his father's company has gone bankrupt, and robs him of the ownership of the apartment.He further notices Emi's beauty and uses her body as a substitute for her debts!Day after day, night after night, lay down her Emi with her minions, and make her virgin brother have sexual intercourse with her Emi.