Emi is a stay at home mom of one. Busy raising her daughter, her husband Akira and her have grown apart and are now in a "sexless" marriage. Another baby? Zero chance at this rate. She turns to her childhood friend Sanae for advice. As a fellow mom and close family friend, she's the only person Emi can be honest with. One day, Sanae asks Emi to babysit as she has to work. After Emi puts them to bed and is waiting for her later that night, to her surprise it's not Sanae who appears, but Sanae's husband, Touma. He looks troubled as he sits down and slowly begins to explain, "Sanae is having an affair. And her affair partner...is Akira."
