"Sperm donation" — a special act in which ordinary men provide sperm to help couples struggling with fertility. [First couple] Married for three years, the husband hopes to conceive through timed intercourse, but his wife, Kaho, is reluctant. After strong persuasion, she agrees to try timed intercourse involving sexual acts with a sperm donor. [Second couple] Married for two years. Though the husband seems uneasy, Wato convinces him and boldly engages in direct intercourse, revealing her lustful nature as she squirts uncontrollably, driven by raw instinct. [Third couple] Married for four years, Yuuri desires a high-pregnancy-rate timed method. After long-abstinent penetration and creampie, she experiences intense pleasure and becomes captivated by its allure. [Fourth couple] Married for five years, Kanna initially appears nervous during the massage, but her pent-up body gradually aches with desire, leading her to seek intercourse with the sperm donor. Though sperm donation is limited to once, Kanna repeatedly asks for "more" afterward. Four beautiful married women indulge in the pleasure of sperm donation for four hours.