A long time ago, people used to believe in fairies - magical little creatures who lived in the woods and could do all sorts of amazing things. Even though we don't often believe in fairies anymore, there are still some people who get very interested in them and want to learn more about them. These people are called the "fairy investigation society."
The fairy investigation society is a group of people who study and collect information about fairies. They read books, talk to people who claim to have seen fairies, and even go out into the woods to try to find them! They like to learn about the habits and behaviors of fairies, what they do all day, and how they interact with humans.
While some people might think that fairies aren't real, the fairy investigation society believes in fairies and works hard to try to find evidence of them. Even if they don't find any real fairies, they still have a lot of fun exploring and learning about the world around them. They hope that one day they might be able to prove that fairies are real and that the magical world of fairyland is just a little bit closer than we might think!