DNA2 (actually, DNA "squared", not "two") is about high school student Junta Momonari, and an agent sent from the future, Karin Aoi. What happens is that in the future, there is this great overpopulation problem caused by someone called the "Mega-Playboy" who seems to be irresistible to women. He fathered one hundred children through one hundred women, and each male became a Mega-Playboy, who fathered more children and so forth. Karin was sent to stop it from the start by shooting Junta with a special bullet which was supposed to stop him from becoming the Mega-Playboy. Unfortunately, she brought the wrong bullet, and it was actually SHE who turned him into the Mega-Playboy, because before he was shot, Junta actually had a strange "allergy" to girls. If he saw a girl in anything sexually explicit, he vomited. So, Karin has the job of turning him back. Since his DNA hadn't stabilized (Mendel had nothing on this storyline), he would sporadically change back and forth between the Mega-Playboy and his normal, old self. Karin attempts several times in the first few episodes to change him back, but she apparently was affected by the Mega-Playboy's charms and actually fainted after seeing him. She attempts to reason with him and Junta actually falls for her. Since women couldn't resist Junta, he has girls swooning over him all over the place, including Tomoko Saeki, whose ex- boyfriend Ryuji Sugashita, who attempts to destroy Junta after that. Junta's, Ami Kurimoto, gets involved. She, coincidentally, is not affected by the Mega-Playboy, and Junta is not affected by her either. What happens next is a series of misadventures that they all must go through. Well, this is one funny story. Especially in the opening scenes where Junta is throwing up everywhere. It's totally unrealistic in the terms of the genetics they're throwing around, but pretty funny. The Mega-Playboy, incidentally can fight extremely well... and I like those fight scenes... he has that Ryu-like coolness. Well, I highly recommend this anime, so go see it!!