Shinichi is a salaryman in his 40s with a wife and children, but he was conscious of his mother as the opposite sex. One day, I tried to confide in my mother in the absence of my family. Saya refused once, but after being asked many times, the two of them went on a trip without telling their families, saying, "If only once ...". An appointment only for today... - In order to save her son, she tells herself so, but her body asks for a man. - The intention is to do it only once, but it drowns in pleasure and intersects many times ...