It''s about a schoolboy, Junta, who have a rare problem: barfing when seen nearly-to-nothing girls. Yes, even he pukes when he look at a playboy magazine. For some reasons, he''s the famous Mega-Playboy which Karin, from the future, is looking for. Karin is on a mission where she must change the Mega-Playboy''s DNA, who slept with 100 women and they had children each, and the children is also mega-Playboy! So you get the idea, that''s why Karin had to go in the time where Junta was right before he become a Mega-Playboy. But why does he have that allergic when he is the Mega-Playboy? How did he become the Mega-Playboy.