The wife committed adultery

The beautiful wife Saeko Matsushita always takes good care of her husband and always loves him. She started living a happy life. And the story next door is that there is a student who doesn't have a lover. He knows that she always lacks sex because her husband is not very interested in her. Because of his interest in this beautiful girl, the student often peeps at her. binoculars, accidentally observed her and saw her masturbating. He was so surprised that he went to the house like a crazy person to steal panties to bring back to someone who was ready to spy on that girl. It was truly magical to see that scene with his own eyes. After a long time of stalking, he was discovered by the girl and what happened?