If you're looking for manga similar to Eko Eko Azarak, you might like these titles.
Welcome to the classes of horror! I will be your guide to a world that lurks under everyday life. For these lessons, you don't need text books or notebooks. If you're prepared for the worst...
Ellen, who has been plagued by sickness her whole life, heavily relies on her mother's care and love. When the bond between them decays in a horrific turn of events, Ellen despairs that she'll never get the love she so desperately craves and thinks she's done for-that is, until she crosses paths with a mysterious black cat. The cat offers her powers and a house to live in, which seems to change Ellen's life for the better. But the new witch soon discovers the gruesome secrets within this ever-changing house...
A witch named Baba-yaga lives deep in the forest. If you're a good kid, she might save you on a whim. If you're a bad kid, she'll devour you.
Doppo Kunikida is an idealist and a strait-laced detective at the Armed Detective Agency, an organization that takes on dangerous jobs that even the police won't handle. Everything in his life is progressing as planned until one day he's ordered to watch over the new guy, Osamu Dazai, a suspicious fellow of unknown origin who is obsessed with the thought of suicide. While investigating an unusual case involving a so-called haunted building, they find several of the missing people from another investigation. However, before they can find out how these cases connect, they are attacked by the mafia's Ryunosuke Akutagawa, sworn enemy of the agency! This is the beginning of a hopelessly inseparable relationship between two detectives. A battle of Abilities erupts in the shadows of Yokohama!