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?
How long have we known each other?
¿Cuántos años crees
que hemos pasado juntos?
¿Cuántos años crees
que hemos pasado juntos?
Dopotutto, da quant'è che ci conosciamo?
Há quanto tempo acha
que nos conhecemos?
Слушай, мы ведь давно знакомы.