The story follows college student Kazuya Kinoshita, dumped by his girlfriend for another guy. He attempts to appease the void in his heart through a mobile app called Diamond to hire Chizuru Mizuhara, a rental girlfriend, to make himself feel better. From their first meeting, she seems to be the perfect girl for him, but is there more to her than meets the eye? And how will their not so typical relationship develop? Find out in, Kanojo, Okarishimasu!