Hajime wanted a child with his wife Chihaya, but it was discovered she couldn't get pregnant. Chihaya, not wanting to be disliked by her husband, asked her mother Reika to be a surrogate. Although confused, Reika agreed to her daughter's desperate request and started pregnancy sex with Hajime! What was supposed to be sex just for making a baby turned into passionate creampie orgasms right in front of Chihaya!