Haramase Meshimase

Igusa Hideaki and Kouenji Sara are lovers, engaged to be married in the future. Their families have been feuding for generations and are therefore vehemently opposed to their relationship. In a moment of anger, Hideaki proclaims: "Sara is pregnant with my child!" That's a lie bound to make their families approve of the marriage. Not only is Sara not pregnant, she's still a virgin! To make it a reality, they begin the babymaking process. However, Nakano Shinobu, the assassin Sara's parents employ, keeps trying to cockblock Hideaki. Will this lie ever change into truth?! [Translated from DLsite]