Tada Rikon Shitenai dake

Masataka works as a freelance writer. He has been married to Yukie for the past 7 years. Yukie works as a school teacher. Masataka and Yukie are not in love with each other. They just haven't gotten divorced. Meanwhile, Masataka is having an affair with a young woman who delivers newspapers. This leads to a shocking situation.
(Source: AsianWiki)