Using the manga by Komiya Sanae and Nonomura Hideki.

Dr. Narutaki, a genius who's wanting to preserve true Japanese men, not the losers they may be today, needs semen from 100 specimens. The problem is these 100 specimens wouldn't make it for him voluntarily, so he happens which has a plan. He gets Marin, an alluring girl from your all girl school, and puts her right into a special costume that transforms into a mans desire and won't are removed until she gets all 100 semen samples. However, Southpole One, a sexaroid manufactured by the doctor's assistant, is interfering by exhausting and taking the men's semen first, so that it is a race.

"For the good chance of Japan, I shall take your semen!"