Mushishi, Yumekui Kenbun Recommendations
I can't count how many times I was reading Nightmare Inspector and was thinking "Wow this reminds me so much of Mushishi" and vice versa. Both of these manga have these strange little stories involving supernatural activities. Although, both main protagonist are very different, Hiruko doesn't care for the customer as long as he gets his nightmare while Ginko really tries to help them. Also Nightmare Inspector's stories usually end bad while Mushishi's usually end good. Either way if you like one you'll definitely like the other, although Nightmare Inspector is like a darker version of Mushishi.
Unusual stories following paranormal phenomena. The stories are often meaningful and don't always have a happy ending.