There will be a special chapter of Hana Kimi as commemoration of it's 20th year. The story is about Mizuki who returns to Japan. It will be printed on Hana Yume's 23rd issue set to be released on November 23. More info from ANN.
In commemoration of it's first year anniversary as well, Spearwood Academy Volume One is free until November 6! Also check out the Facebook Event Page for more giveaways and goodies!