Shinji fell down the stairs at his prep school and was seriously injured. Unfortunately, his parents went on a trip and he was left alone at home. Worried about him, his older brother Kazuo and his sister-in-law Tamaki came to look after him. Shinji had always been attracted to Tamaki, and despite his disabled body, he was transfixed by her figure. However, now he can't even masturbate... Then, noticing Shinji's suspicious behavior, Tamaki made Shinji promise to "just look..." and began to show him obscene acts as if he was amused...