It's a bit hard to give an exact number since the series is ongoing and new books keep coming out. But you can check reliable manga databases or the official publisher's site for the most up-to-date count.
I'm not sure exactly, but there are quite a few. You might want to check the official publisher's website or dedicated manga databases for an accurate count.
The number of books in the Black Butler manga isn't fixed. Over time, more volumes have been published. So far, there are a significant number, but it's best to check the latest updates from the publisher or reliable sources for the most accurate count.
Well, the Black Butler manga series has quite a few books. Currently, it's around 28. But keep in mind that this number might change if there are any additional releases or special editions.
Definitely not. The Black Butler series has a set of established themes such as the supernatural elements, the Victorian - era setting, and the complex character relationships. The idea of a 'leashed slave story' is completely foreign to the official canon and is likely a disturbing creation outside of the proper series. It would go against the overall tone and moral framework of the official work.
There is indeed a 'Black Butler' visual novel. It features the same dark and alluring art style as the anime and manga. The visual novel might include different storylines, some of which could be exclusive to this format, providing a new perspective on the 'Black Butler' world. It often has a strong focus on character development and the complex relationships within the story, which is great for fans who want to explore more about the characters.