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?
Even before that month is up, you will spend 
the night in bed with a girl of my choosing.
Innerhalb dieses Monats wird jede Nacht
eine Frau meiner Wahl
Antes de que pase ese mes,
Antes de que pase ese mes,
Sans attendre la fin du mois,
vous dormirez chaque soir
Anche prima dello scadere del mese, lei passerà
ogni notte a letto con una ragazza scelta da me.
Antes mesmo que esse mês acabe, você passará
a noite com uma garota que eu escolher.
Ещё до истечения месяца вы проведёте
ночь с одной из женщин по моему выбору.