My father-in-law died and my mother-in-law Yuuri became a widow. Atsushi and his wife came to see the situation alone, worried about Yuuri left in the country. As a son-in-law, I was genuinely worried about my mother-in-law, but Yuri was too young and beautiful to call her mother. Now that the barrier of father-in-law has disappeared, Atsushi is swirling with uncontrollable emotions, and Yuuri is also lonely and unable to control her emotions and body. And at the moment when we are alone, our thoughts overlap and cross the line that should not be crossed ...