Rinko Eighteen

Follows the story of Rinko Ikeuchi, the daughter of wealthy parents who's on the fast track to enter medical school, but when her family falls on hard times Rinko is forced to take a job, any job, to make ends meet. When the handsome Sawakura shows up offering Rinko gainful employment she can't really say no, even after she realizes that it involves working as a production assistant in the world of hardcore adult videos. (Source: MU)

18 Rin was adapted into two live-action films that were released in Japan on April 17, 2009, and January 23, 2010.