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?
Right now, that child is mankind's hope.
Diese Kinder sind im Moment
die Hoffnung der Menschheit.
Su hijo es la esperanza de la humanidad.
Su hijo es la esperanza de la humanidad.
Cet enfant est actuellement
l’espoir de l’humanité.
Al momento, 
quel bambino è la speranza dell'umanità.
No momento, essa criança é
a esperança da humanidade.
Сейчас этот ребёнок —
надежда человечества.