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]