DNA2
DNA2
DNA² (D・N・A² ～何処かで失くしたあいつのアイツ～ Dī En Ei Tsū: Dokoka de Nakushita Aitsu no Aitsu) is a science fiction manga series by Masakazu Katsura, which was later adapted into a 15-episode anime series.
Junta Momonari is a high school student with an unusual problem. Whenever he becomes sexually aroused by a woman, his "female allergy" kicks in, causing the poor boy to throw up. Needless to say, he is a complete failure with women, with no hope in sight. Then, one fateful day, Junta is confronted by an attractive girl in strange clothing who claims to be from the future. The girl gives Junta her name as Karin Aoi, and 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. All this started with a single Mega-Playboy, whom Karin has travelled back into the past to deal with.
(Wikipedia: The Free Encyclopedia, s.v. "DNA2")
