Anime Movie - Aisai Nikki 1

It's hard not to be envious of Sanae, the woman everybody wants. She is a young woman who is both attractive and kind. Her spouse, on the other hand, is unsure whether he is good enough for his wife after four years of marriage. He's been unable to have sex with Sanae for a long time, but she hasn't complained. In the end, he decides to ask his buddy to have sex with his wife in order to make her happy. Secretly observing his wife have sex with another guy causes him to feel exhilarated.