The official website for the Monogatari series recently has released a promo video for the Shinobu Mail story of Owarimonogatari. The arc will begin its release starting on this coming 14th of November. Mind you that the 12 episode of this series is covering the first two novel volumes in the series and specifically covering Ougi Formula, Sodachi Riddle and Sodachi Lost from the first novel. It will also be covering the Shinobu Mail chapter from the second novel. Mind you that the Owarimonogatari light novel consists of three total volumes, the first releasing October 2013 called Ougi Formula, Sodachi Riddle and Sodachi Lost. On January 2014 the second volume shipped including the story Shinobu Mail with the third and final volume releasing April 2014. Following this is he promo video for the upcoming arc of Owarimonogatari which can be seenb below:
Below is a plot summary of the series quoted from MAL:
The transfer student with pitch black eyes, Ougi Oshino. As she explains with a smile on her lips, what is Koyomi Araragi’s “starting point”? On that day during his first year in middle school, the boy tastes despair—These are the modern-day oddities! Oddities! Oddities!
A shadow that tells of the end of youth pierces through.