Keisuke tries to spice up his marriage by having one of his subordinates have sex with his wife. He records the encounters and watches them secretly. A young woman has needs. But she would never betray her husband... Keisuke loved his wife Sanae with all his heart. She loved him too. They had a sexless life because of his erectile dysfunction. To satisfy her needs as a woman, he enlisted the help of Ryouichi, thinking only about her sexual well-being. Surely she would enjoy the sex, but not give her heart or true love to another man... Soon paranoid, he filmed Sanae during her sexual encounters. And what he saw. (In Aisai Nikki we see a man (Keisuke) admitting that he is not pleasing his wife (Sanae) and asking another man (Ryouichi) to please her in his place. This is the first subversion of the NTR subgenre. Second, Keisuke watches it all, arguably for the RAGE, which may make him an NTR fan himself, yet another subversion. The third and fourth are both SPOILERS, but the fourth)