On NisiOisin’s Twitter account he announced the latest book in the Monogatari series titled “Nademonogatari”. This is the 3rd off season novel for the Monogatari novel series and will be releasing July 29th in Japan. From what was also said on NisiOisin’s Twitter the character Nadeko Sengoku will be playing a major role in the story. This announcement was made on her birthday which was just yesterday. Previously the off season novels Orokamonogatari and Wazemonogatari were shipped in October and January. There will be a 4th off season novel titled Musubimonogatari set to release this year The novel series by NisiOisin is split up into three different novels with side stories included, anime adaptions of the novel series have also been made. The first one Monogatari series: First Season released between November 1st 2006 and July 28th 2010 with 6 volumes, Monogatari series: second season would release October 27th 2010 and end December 20th 2011 with 6 volumes as well and Monogatari series: Final season released on September 28th 2012 and ended September 18th 2014 releasing 6 volumes. Now below is a plot summary of the series quoted from MAL:
The story centers on Koyomi Araragi, a third year high school student who has recently survived a vampire attack, and finds himself mixed up with all kinds of apparitions: gods, ghosts, myths, and spirits.