In a world where the government wants high school student to have babies, a Fertility Club is created. Mc is a regular high schooler. Chosen by two classmates, Umi and Aika. Umi Touno, with measurements of B90W59H95, likes to wear makeup and accessories, and she seems a bit distant towards mc, in short straight gyaru style. Aika Asaki, with measurements of B103W60H88, is a stunning beauty with big tits and has elder sister aura around her and acts like one to everyone. Faced with the most desirable gal bodies, In front of the best body of a gyaru, mc have to fill their bellies with all of his available semen and support their dreams of motherhood. The thought of him impregnating them fills him with a overwhelming excitement.