DNA²: Dokoka de Nakushita Aitsu no Aitsu

In a future Japan facing severe overpopulation, scientists blame Junta Monamari for the crisis, as he fathered many children and passed on a genetic trait that caused exponential population growth. Karin Aoi, a DNA Operator, is tasked with traveling back in time to change Junta's DNA using a special bullet called DCM, which can suppress the problematic gene. She is financially rewarded for her mission. As she works to prevent Junta from becoming a Mega-Playboy, she begins to develop feelings for him. Meanwhile, Ami, a kind woman who has loved Junta for years, also plays a role in the unfolding events. The future of Japan depends on whether Junta's actions can be changed.