DNA² (D・N・A² ～何処かで失くしたあいつのアイツ～) is a Japanese manga series written and illustrated by Masakazu Katsura. It was serialized in Shueisha's manga magazine Weekly Shōnen Jump from August 1993 to July 1994, with its chapters collected in five volumes.
A 12-episode anime television series adaptation, produced by Madhouse and Studio Deen, was broadcast on Nippon TV from October to December 1994. A three-episode original video animation (OVA) was released from February to June 1995. In North America, the TV series and the OVA were licensed by Central Park Media and released on DVD in 2003. Discotek Media re-licensed the series and released on DVD in 2014.
Plot
Junta Momonari is a high school student with a very unusual problem. Whenever he becomes sexually aroused by a woman, his "female allergy" kicks in, causing him to throw up. One day, Junta is confronted by a girl in strange clothing who claims to be from the future. The girl, called Karin Aoi, tells him about how the world has become terribly overpopulated in her time, to the point where having more than one child is a crime punishable by death. At the root of the problem is a family of "Mega-Playboys": people with sexual charisma and impulses that lead each of them to have 100 children that carry the Mega-Playboy DNA, causing them and all their descendants to each have 100 children as well.