4.101 out of 5 from 173 votes
Count D's pet shop has had roots in numerous countries, from Germany to America and beyond. Always established in the city's Chinatown, Count D offers a variety of rare creatures to qualified buyers. But with his reputation comes skepticism; Count D's shop is rumored to be involved in human trafficking, selling pets that are said to look like men and women. After being investigated in Los Angeles for these alleged crimes Count D sets up shop in the Red Light District of Shinjuku, Tokyo. He continues to offer his services with a curious smile, all the while under the scrutinizing, suspicious gaze of Woo-Fei Rau, D's new landlord.
These are two shoujo/josei (Pet Shop is josei, while Deimos is shoujo from the 70s, an era when shoujo was much darker and more emotionally raw, so it may as well be josei) horror manga. Both are episodic, so you don't really have to read them in any particular order, and the stories focus more on emotional/psychological turmoil than any sort of gore/violence.
Both feature a gorgeous androgynous male with some sort of supernatural power (in Deimos, he's the devil, in Pet Shop, it's a bit less straightforward) who doesn't mind meddling in other's affairs.
Mushi are another form of life which live parallel to our own natural world. The source of many myths and superstitions, they exist according to their own natural laws, and can be both beneficial and dangerous depending on circumstances. Ginko, a traveling mushishi, investigates and helps out wherever the mushi have become a problem. Yet Ginko himself is marked by the creatures he researches, and he carries the weight of his past with him.
Nightmare Inspector follows a supernatural, strange person - similar to Pet Shop - as they investigate the strange ways the paranormal world interacts with the human world. Pet Shop is easily the darker of the two but I think you'd enjoy Nightmare as well.
High in the sky is the Yume Kira Dream Shoppe, a magical place where any dream can be granted in exchange for something dear to you. Rin, the shop's owner, and his plush rabbit assistant Alpha sign contracts with those in need, from a beautiful tree to a girl unable to confess to her secret love. Using rare and powerful items, Rin and Alpha will help bring joy to many lives.
It's true that Yume is very lighthearted and generally happy, while Pet Shop is very dark and feels like more of a precautionary set of tales. Regardless, you can't deny the similarity between the stories, so if you liked one try out the other (just expect a bit of a different tone)