Nightmare Inspector: Yumekui Kenbun(2002)

Yumekui Kenbun

For those who suffer nightmares, help awaits at the Ginseikan Tea House, where patrons can order much more than just Darjeeling. Hiruko is a special kind of a private investigator. He's a dream eater. And he'll rid you of your darkest visions... for a price.

(Source: Viz Media)