The Sasayama family seems to live an ordinary life, but in fact there is a surprising secret that would be bad if others knew it. Her mother, Nozomi, and her son, Tatsuya, are drowning in a relationship between a man and a woman that crosses the line between parent and child. It means that he is enjoying himself. Moreover, Nozomi notices that she is being watched, but instead of cutting off her relationship, she escalates further.
