If you're looking for manga similar to Monkey Mountain, you might like these titles.
It was only supposed to be an innocent hike... but when this group of friends took shelter in the mountains, their lives changed forever thanks to one book. Find all the twist and turns that ensue, as these teens slowly yet surely whittle down.
The group tour I joined with my boyfriend, Xu Bo, encountered a flash flood in a mountain. Everyone disappeared after I woke up and I found myself inside a deep forest. I wanted to find him, so I decided to venture into a mysterious forest that was teeming with danger…
As some trees in Yuzuru Kashiwagi's lush garden mysteriously start withering, he decides to consult Shida, a talented arborist. What he finds, however, is no normal disease...
In a small village by a forbidden forest, siblings Noie and Kubante live together peacefully. Noie is more of a mother than an older sister to Kubante, and she is loved by the village for her industriousness and bright personality. She loves Kubante very dearly, but he's little and weak. He's unable to do as much work as many of the other boys, and is mocked for it by the villagers. One day, an older boy named Shido invites him and some other children to come into the forest, with the promise that they will be changed. The change is much more brutal than any of the children could have foreseen.
During the communist era of China, the people live in desperation. In order to survive, some men have taken to the profession of grave robbing, reclaiming valuables that were buried with the dead. For one team of professionals, however, opening the door to a famous tomb will reveal a much greater horror than they could have imagined...
What's the most terrifying thing in the world? It's not ghosts. It's not demons. But rather finding out that the people living around you have been secretly replaced. The appearance and manner of the TA is exactly the same as the person you are familiar with, but only you know that there is an unknown monster hidden within that human body. Chen Heng realises that his mother is really not her. He alone confronts with the terror, but discovers the more shocking and dreadful other side of the world, hidden within the everyday life.
Slender Man, Mothman, the Butcher, Cecil Hotel, the Slit-Mouthed Woman, Hanako of the Toilet, the Non-existent Stairs of the 13th floor, the Cat-faced Granny, Bus 330, Jack The Ripper… Welcome, travelers, to the world of 999 strange tales - the spirit world.