Well, the theme of appearance vs. reality is quite common. Take Kitsune for example. They can transform into beautiful women, but beneath that appearance is a malevolent spirit. Also, death and the afterlife play a big role. Spirits of the dead often return in these stories to haunt the living, as in the story of Teke - Teke who died in a tragic accident and now haunts the railway tracks. Additionally, the theme of nature's power is present. Yuki - onna is a manifestation of the power of the snow and cold, and can be very unforgiving to humans who underestimate it.
One common theme is the connection between humans and nature. In many stories, animals or natural elements play important roles, like in 'Momotaro' where the animals help the boy. Another theme is the idea of karma or rewards for good deeds. For example, Urashima Taro is rewarded for saving the turtle.
Another theme is transformation. The turtle man can change from a turtle - like form to a human - like form, which represents the fluidity between different states of being. It also can symbolize the idea that things are not always as they seem at first glance. For example, in some stories, the villagers at first don't realize the true nature of the turtle man until certain events occur. And in some cases, the turtle man may transform back to his turtle form when in danger or when he needs to use his special turtle - related powers.
One common theme is the desecration of nature. In many folk horror stories, there are elements where the natural order is disrupted, like in 'The Wicker Man' where pagan rituals that go against the Christian idea of nature are carried out. Another theme is the power of the rural or isolated community. These communities often hold dark secrets and have their own unspoken rules and superstitions that outsiders don't understand. And the theme of the supernatural or the unknown is also prevalent. Ghosts, demons, or ancient spirits that lurk in the woods or old buildings are often part of folk horror stories.
One common theme is the fear of the unknown in nature. In many folk horror short stories, the wilderness or natural elements are often depicted as menacing. For example, in 'The Willows', the willow trees themselves become a source of horror.
In the search results provided, there were several ancient Japanese horror folk novels that could be recommended. Among them," Closed Campus " was a novel with the theme of biological horror. It described the inexplicable mutation of the human body, the distortion of time and space, and the absurd and terrifying scenes. " Kisaragi Station of Doomsday Paradise " was a work from " Japanese Folktales Season 1 ". It told the story of the ancient, mysterious, and long-standing folk legends of Japan. In addition, the " Exorcist " series was the work of the Dark Willow and the Dark Flower. It was strongly recommended as an excellent horror web novel. It mentioned horror elements such as the female in the Flower Falling Cave. Although the search results did not explicitly mention ancient Japanese horror folk novels, the recommended works above all have elements of horror and folklore, and may meet your needs.
One common theme is the supernatural. For example, ghosts are often a big part of Japanese short horror. These ghosts are usually the spirits of the wronged or those who died in tragic ways. Another theme is the idea of cursed objects. Like in the story of the haunted doll, an inanimate object can bring great misfortune. Isolation is also a theme. Many stories take place in lonely places such as old houses or desolate areas, which adds to the sense of horror.
Death and the afterlife are frequently explored in Japanese manga horror stories. Some stories show the cycle of death and rebirth in a very disturbing way. Also, the theme of the uncanny is common. Things that seem familiar at first but then turn out to be something very different and terrifying, such as in 'Pet Shop of Horrors' where the cute - looking pets are actually dangerous. There's also a lot of exploration of human nature's dark side, like envy and greed leading to horror situations.
The idea of a haunted location is very common. Whether it's a school, like in 'Corpse Party', or a village, as in 'Higurashi When They Cry'. These places hold secrets and are often the source of the horror. The animation can really bring these spooky locations to life, making the viewers feel as if they are also trapped in these terrifying places. It gives a sense of dread and unease that is characteristic of Japanese horror.
One common theme is the supernatural. Ghosts, spirits, and curses are often featured. For example, in many stories, there are vengeful spirits that haunt the living due to some past wrong. Another theme is the use of Japanese cultural elements like traditional houses, old shrines, and specific superstitions. For instance, the idea of certain objects or places being haunted because they were once sites of great tragedy or misfortune.
Love and family are common themes. In many folk and stories, the love between characters, like a romantic love between a hero and a heroine, or the deep family love, drives the plot. For example, in some European folk tales, a young man goes on a dangerous journey to save his family from an evil force.