A few days ago, non-fiction writer Katsuragi Shiho came to see Shikibu Takeru at his office in Tokyo. She gave him the key to his apt. and asked him to take care of her things if she did not return from her trip in 3 days. Unfortunately, she did not return in 3 days, nor in 4. Even more mysteriously, nobody seemed to know where she had even gone. Worried, Takeru dug deeper and eventually found 2 witnesses that said they saw Shiho and another woman who looked her age ride the ferry to "Island Kokushi" near Kumamoto. Takeru sets off to try to find her there, but what awaits him is a strange island where nothing is what it seems. In a place haunted with old tradition, a strange religion, and several mysterious deaths, can Takeru find what really happened to his friend?
This manga series is an adaptation of the novel series of the same title by Ono Fuyumi (author of Ghost Hunt) and has the same suspenseful horror story style. Also, please note that the word "Kokushi" is not easily translated b/c it seems to be a word created by Ono-sensei, but it sort of means something like "faith of a non-approved deity".

From Bliss:

Takashi is haunted at night by visions of a woman begging for her child not to be taken away. He sometimes sees strange shadows outside his window, but tries his best to simply ignore them. As his seventeenth birthday approaches, the shadow becomes more and more clear, and the vision more vivid. Slowly, the once kind and caring Takashi becomes indifferent, and eventually cold and biting towards everyone around him. What does this sudden change in attitude have to do with his seventeenth birthday?

Midori's mother has finally acquired her dream home, but it isn't long before supernatural phenomenas disrupt the peace of the family. And if unexplained electricity failures, strange phone calls, and the eerie presence of spirits weren't enough, finding unexplainable blood in the bathroom becomes the last straw. Mai and Shibuya Psychic Research are brought in to investigate, but what horrors will they find in the 'dream' home that turns out to be nothing but a nightmare?
Akumu no Sumu Ie - Ghost Hunt is based on a sequel novel of the original set several months in the future from the original Ghost Hunt. It was published in 1994 and was only two volumes long.
(Source: Wonderland After Hours)

29 years after Tokyo was established as the capital of Japan, a series of bizarre and mysterious crimes happening in the city of Kawara. Mysterious flame demon, dark red princess, fireflies seller, puppeteers also appearing near the place of accident. The perpetrator might be spirits or human's dark side.
Hirakawa Shintaro, a journalist, is investigating those mysterious cases with Manzo's help. Their investigation to find the perpetrator brings them to an intrigue inside Takatsukasa family.