NAGAI Junpei, a high school freshman, wakes up one day to find all of humanity in a deep sleep. In a free world, overflowing with desires, his strange survival days begin.
Volume 4 includes the oneshot The Lost Sexualities.
4 Volumes (Complete)




The women's reactions to being violated are not realistic, since I would think there would be more anger and emotional pain associated with it. Maybe having no memory of it taking place helps I guess, while the scientist character seems to be taken from a h-manga.
The art is bland and seems faded. However, the character designs are good. The story has a great premise, though I've only read the first volume. The pacing is fine, but it drags on a bit in some chapters.
A recommend light read if you like fan service, since it is a borderline h-manga.
Update: Skimmed over the second volume and did not like some of the content, though without a translation I did not understand it either.
i'm downloading it right now, be back for better comment.
comment by thrudgelmir made me laugh, he/she must have read a lot of Kami nomi zo Shiru Sekai
update:
not really nice, the main character has a laid back personality. i cannot enjoy the story implementation of this manga; no emotional content: no fun. the manga goes flat.
A more adult version of Sleeping Beauty, i would say. The prince nowhere as good as the tale was told, but the Princess was real deal, and the end of volume 1 kinda like a flag for harem route for our Prince. But i looking for more development in main character coz right now ,he just as much as annoyance as Shinji Hikari
It's about a boy who is the only one awake in the world, but he discovers he can wake up sleeping females by having sex with them.
Consider Japanese version Sleeping beauty