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?
You should be the one to go 
into cold sleep, Ryuu-nii!
¡Deberían criogenizarte a ti, Ryuu!
¡Deberían criogenizarte a ti, Ryuu!
C’est toi
qu’il faut cryogéniser, Ryû !
Dovrebbero ibernare te, fratellone Ryuu!
Você que é devia dormir
no gelo, Ryuu-nii!
Тебе бы самому в гибернацию, Рю!