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?
It's this world that's weird!
Diese Welt ist seltsam!
¡Este mundo es el extraño!
¡Lo raro es este mundo!
C’est ce monde
qui tourne pas rond !
È questo mondo che è strano!
É esse mundo que está estranho!
Это с миром что-то не так!