It's been three months since she became an official prostitute for the Seika Women's Academy... and now she's going on vacation with three young girls on a deserted island of quiet waves and radiant sun. Tomoe, Mio, and Louise can't contain their sexual desires on the uninhabited white beach. Today, as the time of work beats, the guy strives to give himself up to his bestial sexual desires with the girls. And then, a fourth girl is present at the scene...