Miyanaga Yuki, 19 years old, lives day to day while switching between being unemployed and working part-time jobs. Before he realizes it, he becomes a resident of a world with a male-to-female ratio of 1:1000. Furthermore, the men in this world have very weak s*xual desires and it’s normal for them to release it once a month. If they can do it once a week, they’re considered very virile. As Yuki realizes that men in this world can easily sell their bodies, a beautiful woman who matches his preferences approaches him as they pass each other on the street. “How about 500,000 yen for the night?” This story is set in a world where pick-up lines that would never work in the original world have a 100% success rate — a tale of a world with incredibly convenient circumstances.