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?
Um... there's some reason 
involving the hospital, right?
Oh … Ähm … Da scheint wohl einiges vorgefallen
zu sein. Entschuldigen Sie die Nachfrage.
Hay alguna razón que involucra
al hospital, ¿verdad?
Pero es algo relacionado
con el hospital, ¿verdad?
Ah... Ma è successo qualcosa
con l'ospedale, giusto?
Bom... É algum motivo
envolvendo o hospital, certo?
А, ну... Видимо, причина
как-то связана с больницей?