Looking for a manga

Okay so it was listed as a yuri but it wasnt really one, anyway the story starts off with the main chick waking up in a post apocalyptic city where she is the only person left. The story kind of follows her living in this city, it is worth to mention that she was an exhibitionist and lived in lingerie. She finds this next character that is a male and she calls him porky, she uses him for pleasure and then they decide to leave the city, during their travel they pass through a tunnel, porky dissapears and a new girl is at the end of the tunnel. The main character uses this girl for pleasure then bumps into a couple and finds a boy that is unconcious (turns out this world she was in was a fragment of her imagination from a coma and the boy was a medium trying to get her to wake up) they continue into this deserted place with a ship and a cliff with a crossing and all the characters except one asks her to cross, she dosent and she wakes up from her coma that she got from a ship she was on sinking. Sorry for the super long post, its just i remember this so clearly yet i cant find it.