After losing her husband, a virtuous mother (Chisato) raised her son alone. She loved and supported her son (Minoru). Minoru was a serious young man who wanted to pursue a career in research to make his mother happy. However, due to tuition fees, Chisato couldn't let her son advance to the doctoral program, so she informed him of this. A lecherous professor was aroused by lust and eventually kept and controlled the mother and son within the household… The professor was a leading figure in Japanese literature research but had twisted sexual desires and fetishes.
