It could be related to a mystery surrounding a particular location in the village. Perhaps there's an old, abandoned house in Achiara where strange things happen, and the secret story is all about the history and mystery of that place. It might have been the site of a crime or a place with some supernatural elements that the villagers are either unaware of or are deliberately keeping quiet about.
Maybe it's about some hidden family secrets. For example, there could be a long - forgotten family feud or a secret inheritance that has been kept from the villagers for generations.
I'm not sure as I don't know the story, but it could be things like the village setting, its inhabitants, and the mystery itself.
I'm sorry, I haven't read this story specifically, so I can't provide the full story directly.
I'm sorry, I'm not familiar with the specific 'the village achiara's secret'. You can try to find more information in relevant books or on the Internet.
I don't have the actual story of 'the village achiara's secret' at hand. So I can't introduce it briefly.
One possible theme could be secrecy and its consequences. The villagers might be hiding something that, if revealed, could change the whole dynamic of the village.
I'm not sure specifically as there could be many different 'the secret village stories'. It might be about a hidden village with unique traditions, a mystery within the village, or the lives of the villagers who keep their village's secrets.
Since I don't know the exact 'the secret village story', the main characters could be the village elders who are in charge of keeping the village's secrets.
One more idea is that it's related to a secret society. If someone was expelled from a secret society, the reasons would likely be very hush - hush. It could be because they revealed some of the society's secrets, or they didn't conform to some arcane ritual or code of conduct that is known only to the members.
The mystery might involve a deep family secret or a forbidden love. There could be hidden clues throughout the manga that slowly reveal the truth.
One possible solution could be that there is a hidden passageway. Maybe it's behind a bookshelf or under a rug. Another could be that the mystery involves a character who has been secretly living in the room all along.