Overview:

You are the only man in this world. A world where men other than the main character have died due to a mysterious disease outbreak.
Save humanity with impregnated harems. The battle will not end until everything in this world is impregnated.
The game is a simple clicker game, but the more you click, the more efficient it becomes to impregnate. For example, you can purchase an impregnation factory to increase efficiency, the main character can mutate into his girlfriend’s tentacles and impregnate her in large numbers, etc… You can enjoy impregnation in a wide variety of ways.