QUESTION: I have books 1-27, in english. How many more parts of the story exist? I know book 27 is the first part of volume 11, and have seen books 28 and 29 mentioned here. I've also seen volume 12 mentioned, so would that be 30, 31, and 32? Have those been published in Japan?
I'm only reading the series now, and assumed it was finished until recently discovering otherwise.

Thank you to anyone who can offer some clarification.