Shin Petshop of Horrors (2004)

Blurb:
It’s been several years since the bizarre Chinese Count known only as D left L.A.'s Chinatown. In that time, life has returned to normal in the world and the nightmares associated with Count D’s pet shop of horrors have ceased. But across the Pacific, amidst the bright lights of Tokyo, a mysterious Chinese man has been spotted, and he seems to be opening a new shop... Magical "pets" are the elixirs of people’s dreams—and the potions of their nightmares—in this continuation of the horrifying and tantalizing tale known as the Pet Shop of Horrors.

Source: www.anisearch.com/manga/4399