Professor Narutaki and his assistant Marilyn ask the prime minister of Japan for his approval of their experiment. They want the sperm of 100 males in order to create the children of the future. Naritaki searches a candidate female who\'s got the perfect body in order to collect the sperm quickly. He finds Marine-chan, a clutsy and narrow minded girl and convinces her to do it for the sake of mankind. She accepts and her training to become the perfect sex machine begins. Meanwhile, Marilyn creates a customized sex robot named Karen who can sucks all the sperm in a male body in order to get revenge on Naritaki and ends his long life dream of the perfect child of the future. Marine challenges Karin in order to determine wich girl can make the male ejaculate the fastest. Who will win this contest?? Will Marin be able to collect 100 sperm sample for the professor?? Will Marilyn get her revenge on Naritaki??