"Sperm Donation" is an act where a general male provides sperm for couples struggling with conception. This time, a couple married for three years appears. "Even if I have sex with a different man, you won't mind, right?" The husband, eager for a child, hopes for the timing method, while his wife, Sayaka, opposes any sexual activity with strangers. After successfully meeting the sperm donor, Sayaka flees in fear. Despite her husband's strong desire for the timing method, they reluctantly begin with a massage to boost metabolism...