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The Earth is severely overcrowded and it's only getting worse. Mega-Playboys, men with irresistible charisma and insatiable lust, are running amok, spawning 100 children each and creating new Mega-Playboys with each boy born. Now Karin Aoi has been sent back in time to shoot the original Mega-Playboy with a DNA alteration drug that will prevent him from spreading the Mega-Playboy gene and overpopulating the future world. The boy she targets in the past, however, turns out to be a rather unlikely candidate for a Mega-Playboy. Junta Momonari is literally allergic to women. He vomits at the sight of a bare leg, let alone something even more scandalous. His name matches the one Karin is looking for however, and she desperately wants to solve the overpopulation problem and have the home and family that are impossible in the cramped future she comes from, so she shoots Junta with the drug. Unfortunately, Junta seemed like an unlikely playboy because he isn't a playboy at all: through a mix-up, Karin didn't get rid of the first playboy, she created him. Now she has to amend her mistake before she has no future to return to.