Detective Conan has many doujinshi novels about Haigahara, some of which may contain the following content: 1. Relationship with Conan: There is a complicated relationship between Haihara and Conan. Sometimes, some interesting plots happen, such as Conan and Haihara working together to solve a case or Conan helping Haihara solve a problem. 2. Black Clothes Organization: Ai Haihara was once a member of the Black Clothes Organization, so some doujin novels may describe how she worked in the organization or how she escaped from it. 3. Haihara's personality: Haihara is a smart, calm, and mysterious girl. Some doujinshi novels may describe her personality and lifestyle, as well as her interactions with other characters. Other characters: Other than Haihara Ai, other characters may also receive more attention in Doujin novels, such as Conan's parents, members of other organizations, etc. Ai Haihara in Detective Conan was a character that received a lot of attention, so there were many doujinshi novels about her.