"Sperm donation" is the act of ordinary men donating sperm to couples who are struggling to conceive. [1st couple] A couple in their third year of marriage. "I don't have feelings for the donor when I first meet him." That's what Azu-san tells her husband, reassuring him, but the preparatory massage ignites her carnal desire. In the end, she has sex with him... [2nd couple] A couple in their fifth year of marriage. "It was painful that we couldn't do it. So I might as well try it." That's what Yuki-san, the wife, said, explaining to her husband how badly she wants to have a child. "Even if we cross the line, I'll only kiss my husband," that's what she was supposed to do, but... [3rd couple] A couple in their third year of marriage. "We're both so busy (at work)..." Wife Remi-san and her husband worry that they can't find time for themselves because they're so busy. They fall into the pleasure of having sex with a man they've just met, forgetting about their husband... [4th couple] A couple in their third year of marriage. "I found (information about sperm donation) on the internet..." The husband and his wife Miyu talk awkwardly about their troubled marriage. She turns into a female who greedily seeks intense pleasure and sperm deep in her vagina... This four-hour video features four beautiful wives who were only meant to provide sperm but end up drowning in carnal desires.