Saito, a ronin student, falls in love with Sumire, a married woman who lives next door. - She cares about Saito, offers him dinner, supports him in his entrance exams, and on top of that, she is an unparalleled beauty with an outstanding figure. - There was no reason why he couldn't fall in love with Sumire. - However, although she admires her husband, who is living a happy family with Sumire, there is also a conflict that prevents her from falling in love with him. - One day, Saito hears a scream coming from Sumire's house during the day and rushes to help her.