Sex document: Kuikomu 1981

A typical salaryman family. The father is on a business trip to Kyushu. The only daughter is on a graduation trip from university. And the mother is home alone. It's a scene that could be seen anywhere, but in reality, the father is having an affair and staying overnight at the home of a female employee who is his subordinate. The daughter is on a sex trip with her boyfriend. They are all doing whatever they want, and the poor mother is the one who is at fault. Or so you might think, but a burglar breaks in while the mother is home alone and takes advantage of her. Then her childhood friend and nephew arrives, and the mother hastily introduces the burglar as her husband. The burglar, having no choice but to play the husband, makes a fool of himself by offering the nephew alcohol. The father's affair is interrupted by his girlfriend's ex-boyfriend, and the daughter is also harassed by a strange old man who barges in. So what will happen to these three couples...?