In the near future several developed nations are experiencing catastrophic low birthrate, all of them have their governing bodies scrambling to find a solution; they come up with a idea in conjunction to create resorts where sexual relationships are government mandated and financed with the sole propose of impregnation.
Tanaka Kazuo was an unremarkable young virgin, having trouble finding work but when the government starts a program for mandary health check up, the nurse Hirose Nana is the one who finds out Tanaka was one of the perfect specimen the resort solution was seeking, his dick is big enough, semen is top grade, great amounts with long lasting potency, it even arouses the ladies like an aphrodisiac; Tanaka is immediately hauled there to do his civic duties, women will be provided for him, all expenses covered and he will get paid, Tanaka truly is considered a public servant, working hard in impregnating for the greater good since.
The women Tanaka "works" with are Shikishima Kazuki, a young virgin girl who got sent by her father as part of the program, her dad is one of the professors monitoring the birthrate crisis, Michino Sayaka who has plenty of sex eexperience already and is proud of having all these old uncles kissing her feet, since most of the population are older men none of them have the stamina to make Sayaka submit, but when she hears Tanaka is a potential sex machine Sayaka decides to target him and prove he too is nothing against her; then there's Satonaka Manami, a regular housewife who has kids of her own already, she would have no business being in this program already but circumstances led her there, Manami's husband incurred a huge debt that they have no way to pay it off but an opportunity arose when Sanami was told all what is owed would be paid if she spent some time "working" with Tanaka at the resort; Manami goes through it, reasoning that it is for the sake of her family, she wishes her heart will always be belong to her husband, that what she does is not cheating but merely working for the government.