Due to her husband's desire to have children despite being infertile, Tsubaki, a wife, ends up having sex with a man who offers "sperm donation" found on the internet. Tsubaki, who is standoffish, tells the man, who is physically and academically superior to her husband, "This is only for getting pregnant," "Don't touch my body, and stop kissing." However, this man is overwhelmingly superior as a male, and everything about him was different from her frail husband. Experiencing unknown pleasures with a man who is well-endowed, tireless, and skilled, the throbbing in her womb gradually intensifies as she repeatedly receives creampies...