A tied up married woman - a younger man training hemp rope

Hitomi ends up taking care of her husband's nephew, Hiroshi, during the entrance exam season. After meeting again after a long time, Hiroshi has grown into a young man who is so strong that he can't believe his eyes. Meanwhile, Hiroshi admires beautiful people as they used to be. The relationship between a man and woman, as far apart as mother and child, begins to go insane due to a book of SM magazine purchased by her husband. Unconsciously drawn into the sensual world of SM that they had never known about, the two secretly continue to act, even though they realize that it's a bad thing in the afternoon without their husbands.