"Sperm donation" is the act of ordinary men donating sperm to couples who are struggling to get pregnant. [First couple] A couple in their third year of marriage. "Wouldn't the timing method be better?" The husband and wife Kaho recommend the timing method, which requires sex with the sperm donor. Naturally, she is not keen, but her husband strongly persuades her, and she timidly accepts the timing method. [Second couple] A couple in their second year of marriage. Towa somehow manages to convince her unconvinced husband to have direct sex with the donor. She turns into a lewd woman, exposing her instincts as she squirts. [Third couple] A couple in their fourth year of marriage. "I think it's fine if it makes her happy in the end." Yuri, the wife, wants the timing method, which has the highest pregnancy rate. She feels a strong sense of pleasure from the penetration and creampie for the first time in a long time. [Fourth couple] A couple in their fifth year of marriage. At first, Kanna receives the massage, but her frustrated body gradually begins to ache and she begins to desire sex with the donor. Sperm donation is basically only once. However, as if dissatisfied with that, Kanna san urges "continuation" and begs for sperm. ... It was supposed to be just sperm donation, but the beautiful wives who indulge in carnal desires are recorded for 4 hours.