Doomsday Wonderland - barely has romance. Might have in future chapters but i stopped when i reached latest before around 500 chapters long time ago. But its pretty good and popular back then iirc - Not exactly sure what counts as unlimited flow but it's pretty similar.
There are some, I remember reading a summary about a girl who was very frail, but could rely on her boyfriend to take care of the ghosts, and the game system was annoyed that they were spreading dog food
If you don't mind having to mtl. http://www.jjwxc.net/onebook.php?novelid=5085826 http://www.jjwxc.net/onebook.php?novelid=6058645 http://www.jjwxc.net/onebook.php?novelid=4581340 http://www.jjwxc.net/onebook.php?novelid=5163314