If you're looking for manga similar to Pet Shop of Horrors, you might like these titles. All recommendations are made by Anime-Planet users like you!
Both mangas are supernatural-themed, and both divulge into what are mostly short stories. Unlike Pet Shop of Horrors, however, Beauitful People has no overall connection point and only was eighty pages long. However, if you were interested in the short stories in Pet Shop of Horrors, you'll probably like the ones in Beautiful People (and vice versa), as most of them follow similar themes.