Hikaru Tsutsui, a third-year high school student, is a so-called otaku boy. He feels that he can live alone as long as there are two-dimensional girls in games or animations... But, he is suddenly confessed to by the super 3D (realistic) beautiful girl, Igarashi Iroha, and starts dating her! While being toyed with by the unrestrained Iroha, Tsutsui gradually falls in love with her...