Japan in the future has a massive over-population problem. Scientists have traced the root of this problem to one particular individual, Junta Monamari. According to their records, Junta was a "Mega-Playboy" who sired children with over a hundred women. Each one of his sons inherited the Mega-Playboy gene too, so the problem grew exponentially from thereon. Meet Karin Aoi, a "DNA Operator." Karin is sent back to the past with a mission: to alter Junta's DNA and prevent him from ever becoming the Mega-Playboy, thereby eliminating the world's overpopulation problem. Junta's DNA can only be...