Behind her husband's back, the mother Mai and her son Tatsuya were having a sexual relationship. It was her husband's fault for not paying attention to her because he was always working. Mai tried to escape from her guilt by making this excuse to herself. However, her sense of indebtedness towards her husband grew stronger with each passing day, and Mai, unable to bear it any longer, tried to cut off her relationship with her son, but... Her son, obsessed with Mai's body and turned into a sex addict, couldn't stop. Mai verbally rejected him, but her body craved her son...