In the future, society has a MAJOR population problem. The cause is the Mega-Playboy, men who are totally irresistible to women, due to their genes. One Mega-Playboy can make 100 women pregnant and the boys also become Mega-Playboys. Karin is an agent sent to the past to find the first Mega-Playboy and stop him with a special bullet. Karin, who dreams of having her very own "Sweet Home" (a rarity in the overcrowded future) finds the original Mega-Playboy, a young man named Junta. Junta has a problem; he throws up at anything even REMOTELY sexual, you do NOT want to be around if he glimpses a girl`s panties! Perplexed, Karin shoots him anyway, then finds out she shot him with the wrong bullet! The drug inside of the bullet turns Junta into a Mega-Playboy and back. Now Karin has to figure out how to get out of the mess that she created, or else she won`t get her sweet home! Other players in this chaos are Ami, a girl that Junta grew up with (and the only one he doesn`t get sick around), Tomoko, first victim of Junta`s Mega-Playboy powers and Ryuuji, the jealous boyfriend. Not to mention the hordes of girls who swoon when Junta powers up, including Karin.