Kashiwagi, who works in the construction industry, gets injured on the job and ends up hospitalized in a city hospital for a while. One day, while idly passing the time with nothing to do, his old classmate Akira and Akira's wife Kanna-chan come to visit him. "Is your injury okay, Kashiwagi-kun?" "Is there anything we can help you with?" they say, smiling and gently taking care of him—his "classmate's wife." Captivated by her indescribably sweet allure, Kashiwagi's dick, pent up from his hospital stay, irresponsibly gets hard.