It has been three years since Nanami started having sexual relations with her son. At first, I helped my son retreat to his room and continue to masturbate, feeling it was dangerous. Of course, I knew it was wrong, but I convinced myself that it was only a temporary measure until my son returned to society. Her husband seems suspicious about their relationship, although he does not fully understand the issue. I keep telling myself that I need to end this relationship as soon as possible, yet my son insists on selling himself without listening to Nanami's persuasion. That's how the careless relationship continues ...