"Sperm donation" refers to the act of a man donating sperm to a couple struggling to conceive. [First Couple] Married for three years. "Wouldn't the timing method be better?" The husband and wife, Kaho, recommended the timing method, which requires sexual intercourse with the donor. She was naturally not enthusiastic, but under her husband's strong persuasion, she timidly accepted the timing method. [Second Couple] Married for two years. Towa managed to convince her disbelieving husband to have direct sexual intercourse with the donor. She became a wanton woman, exposing her instincts during orgasm. [Third Couple] Married for four years. "If it makes her happy in the end, I think it's fine." The wife, Yuri, wanted the timing method, which had the highest pregnancy rate. She experienced the intense pleasure of penetration and ejaculation for the first time in a long time. [Fourth Couple] Married for five years. At first, Kanna felt nervous during the massage, but her frustrated body gradually began to ache, and she began to crave sexual intercourse with the donor. Sperm donation is basically only once. However, Ms. Kanna seemed dissatisfied with this, urging "to continue" and pleading for more sperm. ...Originally it was just a sperm donation, but the beautiful wives who were addicted to lust were filmed for 4 hours.