"Sperm donation"... a practice where ordinary men provide sperm for couples struggling with fertility. [First couple] A married couple for two years. Wife Yui says, "Due to our age difference, it's been quite difficult to conceive." Her older husband quietly nods in agreement, and due to their age-gap marriage and strong desire for a child, they've placed hope in sperm donation. They are seriously attempting timed intercourse methods known for higher pregnancy rates. [Second couple] Married for seven years. Wife Himeno shares her distress: "It's because of my husband's male infertility..." With age working against them, they consider direct sexual intercourse with a donor. During preparatory massage, her lust builds, and the film captures how this elegant, refined housewife gradually transforms into a lustful woman. [Third couple] Married four years. Wife Mai convinces her husband, saying, "It's less physically taxing," and proposes direct intercourse with the donor. Her sweet moans fill the air as she passionately succumbs to intense, genuine sex. [Fourth couple] Married two years. Sana, who traveled from distant Miyazaki after discussing with her husband, decides, "Since we're here anyway..." to engage in direct intercourse with the donor. The video captures her writhing in overwhelming pleasure with every thrust of her hips. Four beautiful married women surrender to desire under the premise of sperm donation, recorded in over four hours of intense, passionate encounters.