Mizuhara Reito is an ordinary boy who wakes up in a world of 5 billion women and 5 men. Now it's up to him to repopulate the human species. Can he stay loyal to his missing childhood friend when all humankind is counting on him to sleep with as many girls as possible?
The world's population has decreased 
by half over the past four years.
In diesen vier Jahren hat sich
die Weltbevölkerung halbiert
La población mundial se redujo
a la mitad en este tiempo.
La población mundial se ha reducido
a la mitad en este tiempo.
La population mondiale
a été réduite de moitié.
La popolazione mondiale si è dimezzata
negli ultimi quattro anni.
A população mundial caiu
à metade nos últimos quatro anos.
За эти годы численность
населения сократилась вдвое.