His father-in-law passed away and his mother-in-law, Yuri, became a widow. Atsushi and his wife came to check on Yuri, who was left alone in the countryside. As a son-in-law, they were genuinely worried about their mother-in-law, but Yuri was too young and beautiful to call her mother. Now that the barrier of his father-in-law is gone, Atsushi's feelings for Yuri are swirling inside him and Yuri is also feeling lonely and unable to control her emotions and body. And the moment they are alone, their feelings overlap and they cross a line that should never be crossed...